Single-shaft pressurizing device

Abstract

The utility model discloses a single-shaft pressurizing device. The single-shaft pressurizing device comprises a pressurizing cavity and a pressure generating assembly, the pressurizing cavity is provided with a channel capable of accommodating the pressure generating assembly, and a placement table for placing a to-be-pressurized sample is arranged at the bottom of the channel; the pressure generating assembly comprises a lower pressing column, an elastic piece, a pressure maintaining sleeve and an upper pressing column which are sequentially arranged in the pressurizing cavity. The top of the pressurizing cavity is fixed to the pressure maintaining sleeve through internal threads, and the upper pressing column can penetrate through the pressure maintaining sleeve to make contact with the elastic piece. The size of the bottom channel of the pressurizing cavity is matched with that of the pressing column, and the pressing column can be exactly contained. In this way, the sample placed on the object placing table is always vertically downward under the force of the downward pressing column, and the out-of-plane direction pressurization regulation and control of the sample are achieved.

Description

Technical Field

[0001] The present application relates to the technical field of quantum state control experiments, and in particular to a uniaxial pressurizing device. Background Art

[0002] In the study of condensed matter physics, pressure control is a key experimental method. Pressure can significantly change the physical properties of matter, so precise pressure control is indispensable when exploring new properties of matter or understanding its internal mechanism.

[0003] Existing pressure devices that apply pressure to samples usually use a diamond anvil cell (DAC) or a uniaxial pressure device based on piezoelectric ceramics. However, the pressure applied by the diamond anvil cell comes from all directions, not a single direction; the uniaxial pressure device based on piezoelectric ceramics can only apply pressure to the sample surface, and the pressure that can be applied is very limited. Existing pressure devices cannot achieve pressure regulation of the sample in the out-of-plane direction. Utility Model Content

[0004] The embodiment of the present application solves the problem that the prior art cannot realize out-of-plane pressure regulation of the sample by providing a uniaxial pressurizing device.

[0005] In order to achieve the above purpose, the technical solution of the embodiment of the present application is:

[0006] In the first aspect, an embodiment of the present application provides a uniaxial pressurizing device, comprising: a pressurizing chamber and a pressure generating assembly; the pressurizing chamber has a channel capable of accommodating the pressure generating assembly, and a placement table for placing the sample to be pressurized is arranged at the bottom of the channel; the pressure generating assembly comprises a lower pressure column, an elastic member, a pressure maintaining sleeve and an upper pressure column sequentially arranged in the pressurizing chamber; the top of the pressurizing chamber is fixed by an internal thread and a pressure maintaining sleeve, and the upper pressure column can pass through the pressure maintaining sleeve and contact the elastic member; the size of the channel at the bottom of the pressurizing chamber matches the size of the lower pressure column, and can just accommodate the lower pressure column.

[0007] In some possible implementations, gaskets are provided at both ends of the elastic member, and the height of the gaskets can be adjusted.

[0008] In some possible implementations, a first connection structure for connecting a sample holder of a physical property measuring instrument is disposed at the bottom of the pressurized chamber, and a second connection structure for installing a simulation cover of the sample holder is disposed at the top of the pressure maintaining sleeve.

[0009] In some possible implementations, the top of the pressurized cavity has an external thread, and the pressurized cavity can be fixed by the external thread and the pressure platform.

[0010] In some possible implementations, when the uniaxial pressurizing device is fixed on the pressure platform, the bottom of the uniaxial pressurizing device is suspended in the air.

[0011] In some possible implementations, a sapphire gasket is provided between the sample and the storage table, and the sapphire gasket can be fixed in the center of the storage table; the sapphire gasket includes an upper sapphire and a lower sapphire, the lower sapphire is rectangular, and the upper sapphire is round, and the sample is placed on the lower sapphire.

[0012] One or more technical solutions provided in the embodiments of the present application have at least the following technical effects or advantages:

[0013] The present application provides a uniaxial pressurizing device, including: a pressurizing chamber and a pressure generating assembly; the pressurizing chamber has a channel capable of accommodating the pressure generating assembly, and a storage platform for placing the sample to be pressurized is provided at the bottom of the channel; the pressure generating assembly includes a lower pressure column, an elastic member, a pressure maintaining sleeve, and an upper pressure column sequentially arranged in the pressurizing chamber; the top of the pressurizing chamber is fixed by an internal thread and a pressure maintaining sleeve, and the upper pressure column can pass through the pressure maintaining sleeve and contact the elastic member; the size of the channel at the bottom of the pressurizing chamber matches the size of the lower pressure column, and can just accommodate the lower pressure column. In this way, the sample placed on the storage platform is always vertically downward due to the force of the lower pressure column, so that the out-of-plane pressure regulation of the sample is achieved. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the embodiments of the utility model, the drawings required for use in the embodiments of the utility model will be briefly introduced below. Obviously, the drawings described below are some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0015] Figure 1 This is a schematic structural diagram of a uniaxial pressurizing device in an embodiment of the present application;

[0016] Figure 2 It is a structural schematic diagram of the pressure-bearing platform in the embodiment of the present application;

[0017] Figure 3 This is a schematic diagram of the structure in which a pressurizing device with PUCK installed in an embodiment of the present application is fixed on a pressure platform;

[0018] Figure 4 is a schematic structural diagram of a pressurized chamber in an embodiment of the present application;

[0019] Figure 5 This is a schematic diagram of the structure of the lower pressure column in the embodiment of the present application;

[0020] Figure 6 is a schematic diagram of the structure of the elastic member in the embodiment of the present application;

[0021] Figure 7 This is a schematic diagram of the structure of the pressure maintaining sleeve in the embodiment of the present application;

[0022] Figure 8 It is a schematic diagram of the structure of the upper pressure column in the embodiment of the present application;

[0023] Fig. 9 This is a schematic diagram of the sample test circuit connection in the embodiment of the present application. DETAILED DESCRIPTION

[0024] The technical solutions in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0025] In the relevant description of this embodiment, the terms "including, containing, having" and the like are open terms and are generally understood to include but not be limited to; the term "at least one" is generally understood to mean one or more, where "plurality" refers to two or more; the term "at least one of the following" or similar expressions refers to any combination of these items, including any combination of single or plural items, for example, "at least one of a, b or c", or "at least one of a, b and c", can all represent: a, b, c, ab (i.e., a and b), ac, bc, or abc, where a, b, c can be single or multiple, respectively; the symbol "A / B" is used to describe the selection relationship of associated objects, generally indicating an "or" relationship before and after.

[0026] In the following description of the present embodiment, the terms used in the embodiments of the present application are only for the purpose of describing specific embodiments, and are not intended to limit the present application. The singular forms "a" and "the" used in the embodiments of the present application and the appended claims are also intended to include plural forms, unless the context clearly indicates other meanings.

[0027] Those skilled in the art should understand that in the following description of the embodiments of the present application, the order of serial numbers does not mean the order of execution, some or all of the steps can be executed in parallel or sequentially, and the execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present application.

[0028] Those skilled in the art will appreciate that the numerical ranges in the embodiments of the present application are to be understood as each intermediate value between the upper and lower limits of the scope being specifically disclosed. Each smaller range between the intermediate value in any stated value or stated range and any other stated value or intermediate value in the range is also included in the present invention. The upper and lower limits of these smaller ranges may be independently included or excluded in the scope.

[0029] Unless otherwise specified, the technical / scientific terms used herein have the same meanings as those generally understood by those skilled in the art to which this application belongs. Although this application only describes preferred methods and materials, any methods and materials similar or equivalent to these may also be used in the implementation or testing of this application. All documents mentioned in this specification are incorporated by reference to disclose and describe methods and / or materials related to the documents. In the event of a conflict with any incorporated document, the content of this specification shall prevail.

[0030] In order to illustrate the technical solution of the present utility model, specific embodiments are provided below for illustration.

[0031] In the study of condensed matter physics, pressure control is a key experimental method. Pressure can significantly change the physical properties of matter, so precise pressure control is indispensable when exploring new properties of matter or understanding its internal mechanism.

[0032] Existing pressure devices, such as the Diamond Anvil Cell (DAC) and the uniaxial pressure device based on piezoelectric ceramics, meet the experimental needs to a certain extent, but they each have obvious limitations. For example, the diamond anvil cell uses the extremely high compressive strength of diamond to apply pressure to the sample. However, the problem with this device is that the pressure it applies is in all directions, not in a single direction. This means that the pressure will not only act on the sample, but also on other structures at the same time, which may affect the experimental results. The uniaxial pressure device based on piezoelectric ceramics is specially designed to apply in-plane pressure. This means that it can only affect the properties of the sample in one plane, but cannot apply out-of-plane pressure, that is, apply pressure perpendicular to the sample. This may limit the flexibility of the experiment in some cases. What's more serious is that the pressure that this device can apply is limited, so it may not meet the requirements for experiments that require higher pressure.

[0033] Based on this, the utility model provides a pressurizing device, which solves the problem that the prior art cannot realize pressurization regulation of the sample in the out-of-plane direction.

[0034] Figure 1 This is a schematic diagram of the structure of a uniaxial pressurizing device in an embodiment of the utility model, see Figure 1As shown, the uniaxial pressurizing device comprises: a pressurizing chamber 11 and a pressure generating assembly 12;

[0035] The pressurizing chamber 11 has a channel 111 capable of accommodating a pressure generating assembly, and a placement table 112 for placing a sample to be pressurized is provided at the bottom of the channel 111; the pressure generating assembly 12 passes through the channel 111 to apply pressure to the sample placed on the placement table 112 at the bottom of the channel 111.

[0036] The pressure generating assembly 12 includes a lower pressure column 121, an elastic member 122, a pressure maintaining sleeve 123 and an upper pressure column 124 which are sequentially arranged in the pressurizing chamber 11; when the pressure generating assembly 12 is installed in the pressurizing chamber 11, the lower pressure column 121 can just contact the sample on the storage table 112.

[0037] The top of the pressurized chamber 11 is fixed by an internal thread and a pressure-maintaining sleeve 123, and the upper pressure column 121 can pass through the pressure-maintaining sleeve 123 and contact the elastic member 122; the process of the pressure generating assembly 12 applying pressure to the sample is as follows: the upper pressure column 124 is pressed by a pressure device, and the upper pressure column 124 pushes the elastic member 122, and the elastic member 122 is elastically deformed by the pressure, and the pressure is transmitted to the lower pressure column 121, so that the lower pressure column 121 applies pressure to the sample. At the same time, each time the upper pressure column 124 descends a certain distance, a portion of the pressure-maintaining sleeve 123 is tightened accordingly, so that the pressure-maintaining sleeve 123 can maintain the pressure on the elastic member 122. After the required pressure is applied, the upper pressure column 121 can be removed, and the pressure is maintained only by the pressure-maintaining sleeve 123.

[0038] The size of the channel at the bottom of the pressurized chamber 11 matches the size of the lower pressure column 121, and can just accommodate the lower pressure column 121. In this way, the lower pressure column 121 will not swing at the bottom of the pressurized chamber 11, ensuring that the pressure from the elastic member 122 on the lower pressure column 121 is always vertically downward, thereby ensuring that the pressure applied by the lower pressure column 121 to the sample is always vertically downward, that is, achieving out-of-plane pressure on the sample.

[0039] It should be noted that the size matching degree between the bottom channel of the pressurized cavity 11 and the lower pressure column 121 is the key to ensure the stable transmission of pressure. This size matching not only includes the matching of physical dimensions, but also involves comprehensive consideration of multiple aspects such as shape, tolerance and material. For example, in order to ensure that the lower pressure column 121 does not swing sideways during the pressing process, the gap between the bottom channel and the lower pressure column 121 should meet certain threshold requirements. This threshold may be a specific value, such as 0.05mm, or it may be a range, as long as the stability of the lower pressure column 121 and the accurate transmission of pressure can be ensured. In addition, in addition to size matching, the choice of material is also an important factor affecting pressure stability. The materials of the pressurized cavity 11 and the lower pressure column 121 should have sufficient rigidity and pressure resistance to ensure that good structural stability can be maintained under high pressure.

[0040] In summary, through precise size design and material selection, the lower pressure column 121 can stably apply pressure in the pressurized chamber 11 and ensure that the pressure is always vertically downward, thereby achieving precise pressure regulation of the sample in the out-of-plane direction. In this way, the accuracy and reliability of pressure regulation in condensed matter physics experiments are improved.

[0041] It can be understood that the function of the elastic member 122 is to uniformly transfer the pressure from the upper pressure column 124 to the lower pressure column 121, so that the pressure applied by the lower pressure column 121 to the sample is always vertically downward. Based on this, in some embodiments, the elastic member 122 can be any structure that can stably transfer pressure. For example, the elastic member 122 can be any structure such as a spring, an elastomer, a pneumatic or hydraulic system, or an electromagnetic system.

[0042] Exemplarily, the elastic member 122 can be any type of elastomer, i.e., certain elastomeric materials. Such as silicone rubber or rubber, these elastic materials can provide elasticity similar to that of a spring, and in some cases can provide better durability and stability. The elastic member 122 can also be a pneumatic or hydraulic system. A pneumatic or hydraulic system can provide a stable force or displacement by controlling the pressure. It requires an external source of compressed gas or hydraulic oil, but can provide a larger elastic force range and more precise control. The elastic member 122 can also be an electromagnetic system. The electromagnetic system can change the strength and direction of the magnetic field through an electric current, thereby generating a force or displacement. This type of system can be remotely controlled, providing programmable elasticity and precise control.

[0043] In some embodiments, the pressure applied to the sample placed on the stage 112 by the uniaxial pressurizing device can be determined by calculating the area of ​​the elastic member 122 and the sample.

[0044] Exemplarily, taking the elastic member 122 as a spring, the pressure borne by the sample can be determined by determining parameters such as the spring constant, the compression distance of the spring, and the area of ​​the sample. Based on these parameters, the pressure borne by the sample can be determined.

[0045] In some embodiments, the pressure to which the sample is subjected can also be directly determined by the pressure reading displayed by the pressure device.

[0046] Exemplarily, in the embodiment of the present application, the pressure can be applied to the above-mentioned uniaxial pressurizing device by a pressure applying device with pressure display data. For example, the pressure applying device can be a hydraulic press with pressure data display. In this case, the pressure applied to the sample can be directly determined by reading the pressure data indication of the hydraulic press.

[0047] In some embodiments, gaskets are provided at both ends of the elastic member 122, and the height of the gaskets can be adjusted.

[0048] It is understandable that in order to ensure the uniform transmission of pressure, the structural design between the upper pressure column 124, the elastic member 122 and the lower pressure column 121 is particularly important. First of all, considering the uniformity of pressure, gaskets can be placed between the upper pressure column 124, the elastic member 122 and the lower pressure column 121. These gaskets can play two roles: one is to increase the friction between the three to ensure the stability of pressure during the transmission process; the second is to make up for possible manufacturing errors so that the pressure is more evenly transmitted to the lower pressure column 121, and finally achieve uniform pressure on the sample. Secondly, in order to further optimize the uniformity of pressure, it is possible to consider using some specially designed gaskets. For example, the gasket can be made of elastic material to better absorb and disperse pressure. In addition, the height and hardness of the gasket can be adjusted according to experimental requirements to achieve the best pressure distribution effect.

[0049] It is understandable that in order to achieve precise pressure control of the sample, in addition to considering the directionality, stability and uniformity of the pressure, it is also necessary to consider how to adapt to elastic parts of different heights. In order to meet this demand, the use of gaskets of different heights has become an effective solution. The use of gaskets can not only ensure the uniform transmission of pressure between the upper pressure column 124 and the lower pressure column 121, but also adapt to elastic parts 122 of different heights by adjusting the height of the gasket. In this way, even if the height of the elastic parts is different, the stable and uniform transmission of pressure can be ensured by selecting suitable gaskets.

[0050] Specifically, the height of the gasket may be adjusted by changing the number of gaskets, or by replacing gaskets with different thicknesses.

[0051] In some embodiments, in addition to the use of gaskets, in order to ensure uniform transmission of pressure, the uniformity of pressure can also be improved by optimizing the assembly relationship between the upper pressure column 124, the elastic member 122, and the lower pressure column 121. For example, a precise assembly process can be used to ensure that the relative positions of the three are accurate, thereby ensuring uniform transmission of pressure.

[0052] In summary, by arranging appropriate gaskets between the upper pressure column 124, the elastic member 122 and the lower pressure column 121 and optimizing the assembly process, uniform pressure can be applied to the sample, thereby improving the accuracy and reliability of the experiment.

[0053] In some embodiments, the uniaxial pressurizing device provided in the embodiments of the present application can be used in conjunction with a physical property measuring instrument to measure the physical property parameters of a sample at different temperatures. This is described below with a specific embodiment. The uniaxial pressurizing device is hereinafter referred to as a pressurizing device.

[0054] The Physical Property Measurement System (PPMS) is an advanced physical property testing instrument, which is mainly used to measure the physical properties of various materials under extremely low temperature and strong magnetic field environment. It was developed by Quantum Design, USA, and uses a self-circulating liquid helium system to achieve a temperature range of 1.9K-400K, and a superconducting coil to achieve a test condition of a magnetic field range of ±9T. It is equipped with a variety of measurement options, such as DC resistance module (R module), advanced electric transport module (ETO module), vibration magnetometer module (VSM module), etc. The mainframe of PPMS includes control host, liquid helium dewar, refrigeration compressor, water chiller and other parts, which can provide a low temperature and strong magnetic field environment as well as the software and hardware control center of the entire system. Users can select various measurement options and extended function options of their interest based on the basic system platform, and perform various physical property measurements, such as AC and DC resistivity, magnetoresistance, differential resistance, Hall coefficient, volt-ampere characteristics, critical current, AC magnetic susceptibility, hysteresis loop, thermomagnetic curve, specific heat, thermoelectric effect, Seebeck coefficient, thermal conductivity and morphology characterization, etc. The characteristics of PPMS include high precision, high stability, and strong scalability. It has high temperature and magnetic field control accuracy and good stability. It can provide an extremely low temperature and strong magnetic field environment, which is suitable for the research and testing of various materials. At the same time, the system also has the characteristics of strong scalability. Users can choose different measurement options and expansion functions according to their needs to perform more flexible and diversified physical property measurements.

[0055] In PPMS, the role of the sample holder (PUCK) is to support and fix the sample for various physical property measurements. PUCK is usually made of polyimide material, which has good insulation and high temperature resistance. It has the size and shape of a standard sample, can be easily placed in the sample chamber of PPMS, and can accurately measure the sample through temperature and magnetic field control. The design of PUCK can ensure that the sample is stably fixed on the tray during the measurement process without moving or sliding. At the same time, the PUCK sample holder can also effectively reduce thermal resistance and heat leakage, helping the sample to better exchange heat with the low temperature environment in the Dewar, thereby improving the accuracy and stability of the measurement.

[0056] Specifically, the pressurizing device is used in conjunction with the PPMS to measure the physical property parameters of the sample at different temperatures. After applying pressure to the sample through the pressurizing device, the pressurizing device and the PUCK are connected, and then the pressurizing device connected with the PUCK is placed in the PPMS as a whole, so as to obtain the physical property parameters. Based on this, in some embodiments, a first connection structure for connecting a sample holder of a physical property measuring instrument is provided at the bottom of the pressurizing chamber, and a second connection structure for installing a simulation cover of the sample holder is provided at the top of the pressure maintaining sleeve.

[0057] It is understandable that the first connection structure and the second connection structure are used to fix the PUCK and the simulated cover of the PUCK to the pressurizing device. In the embodiment of the present application, the first connection structure and the second connection structure can be implemented by any fixing structure, and the first connection structure and the second connection structure can be the same structure, or can also be different structures. The embodiment of the present application does not specifically limit this.

[0058] Exemplarily, the first connection structure and the second connection structure may be threaded structures, that is, the PUCK and the bottom of the pressurized chamber 11 are connected together by a threaded structure, and the PUCK simulation cover and the pressure maintaining sleeve 123 are also connected together by a threaded structure. Alternatively, the first connection structure and the second connection structure may be bolt structures. That is, the PUCK is fixed to the bottom of the pressurized chamber 11 by a bolt structure, and the PUCK simulation cover is fixed to the top of the pressure maintaining sleeve 123 by a bolt structure. Alternatively, the first connection structure and the second connection structure may also be different fixing structures. For example, the first connection structure is a bolt structure, and the second connection structure is a threaded structure.

[0059] It is understandable that when placing a sample into PPMS for measuring various physical parameters, the traditional method is to first place the sample on PUCK, and then use a special sleeve tool for PPMS to absorb the side of PUCK, and then place it as a whole into the sample chamber of PPMS. In this process, PUCK plays a key role as a support and fixing tool for the sample. However, this method may not be convenient enough in some cases, especially when the sample needs to be replaced or adjusted frequently. In an embodiment of the present application, a PUCK simulation cover is installed on the top of the pressure maintaining sleeve 123. This simulation cover can provide a more convenient and safe way to take and place samples while maintaining the original function of PUCK. Specifically, when the entire device needs to be placed in PPMS, the operator can use a special sleeve tool for PPMS to directly absorb the PUCK simulation cover, and then easily put the entire device (including the sample, PUCK simulation cover, PUCK and pressurizing device) into the sample chamber of PPMS.

[0060] The convenience of this operation mainly includes: first, due to the design of the PUCK simulation cover, the operator no longer needs to handle the PUCK and the sample separately, thus simplifying the operation steps; second, using the PPMS special sleeve to directly adsorb the PUCK simulation cover can ensure that the entire device remains stable during movement, avoiding accidental movement or damage of the sample; finally, the entire placement process is faster and more efficient, which helps to improve experimental efficiency. At the same time, this operation method is also safer. Since the entire device is placed in the PPMS as a whole, the contact between the sample and the external environment (such as air, dust, etc.) during operation is reduced, thereby reducing the risk of sample contamination or damage. In addition, the use of the PPMS special sleeve for adsorption and movement also reduces the chances of operators directly contacting the sample, further improving the safety of the operation.

[0061] It is understandable that after the pressurizing device is installed with PUCK, the bottom of the pressurizing device can no longer withstand huge pressure. In order to obtain the physical properties of the sample at different temperatures, it is necessary to change the pressure of the sample. Based on this, in some embodiments, the top of the pressurizing chamber 11 has an external thread, and the pressurizing chamber 11 can be fixed to the pressure platform through the external thread.

[0062] Wherein, when the pressurizing device is fixed on the pressure-bearing platform, the bottom of the pressurizing device is suspended in the air.

[0063] Figure 2 is a schematic structural diagram of the pressure platform 20 in the embodiment of the present application, Figure 3 Schematic diagram of the structure of the pressurizing device with PUCK installed on the pressure platform 20 in the embodiment of the present application. Figure 2 and Figure 3As shown, the bottom of the pressure platform 20 has a receiving space 21, and the center of the top of the pressure platform 20 has a thread 22. The thread 22 can cooperate with the external thread at the top of the pressurizing chamber 11, so that the pressurizing device is fixed on the pressure platform 20, and the PUCK is installed at the bottom of the pressurizing device. Figure 3 The PUCK is marked as 31, and is fixed together with the pressurizing cavity 11, and is located in the receiving space 21 at the bottom of the pressure-bearing platform 20. Specifically, Figures 4 to 8 This is a schematic diagram of the structure of the pressurized cavity 11 and the pressure generating assembly 12 of the embodiment of the present application. Figure 4 is a schematic structural diagram of the pressurized chamber 11 in the embodiment of the present application, Figure 5 This is a schematic diagram of the structure of the lower pressure column 121 in the embodiment of the present application. Figure 6 is a schematic diagram of the structure of the elastic member 122 in the embodiment of the present application, Figure 7 This is a schematic diagram of the structure of the pressure maintaining sleeve 123 in the embodiment of the present application. Figure 8 Schematic diagram of the structure of the upper pressure column 124 in the embodiment of the present application.

[0064] It can be understood that when the pressure device is fixed on the pressure platform and pressure is applied by the hydraulic press, the force borne by the bottom of the pressure device can be transferred to the side of the pressure chamber 11, and the thread structure composed of the external thread at the top of the pressure chamber 11 and the thread 22 at the center of the pressure platform bears the pressure. In this way, when the pressure needs to be changed, there is no need to remove the PUCK at the bottom of the pressure device, and different pressures can be directly applied to the sample, which greatly simplifies the steps of changing the pressure.

[0065] In some embodiments, a sapphire gasket is provided between the sample and the stage, and the sapphire gasket can be fixed in the center of the stage; the sapphire gasket includes an upper sapphire and a lower sapphire, the lower sapphire is rectangular, the upper sapphire is round, and the sample is placed on the lower sapphire. The upper sapphire is fixed to the lower surface of the lower pressure column, and when the sample is pressurized, the sample is clamped between the upper sapphire and the lower sapphire.

[0066] Understandably, when applying pressure in a hydraulic press, the sample is subjected to extreme forces. To protect the sample from being crushed or damaged, it is usually placed on a surface that can withstand this force. Sapphire is a very hard material that can withstand extremely high pressures, making it an ideal choice for this purpose. Another advantage of sapphire is that it does not deform or slip under high pressure like some other materials, which ensures that the pressure is applied accurately.

[0067] In addition, the use of rectangular and circular sapphire gaskets can play a multi-faceted role. First, the stacking of gaskets can ensure the uniform distribution of pressure, avoid the problem of local overpressure or underpressure on the object, and effectively protect the object from damage. Secondly, the gasket acts as a buffer layer to reduce the impact force on the object and further reduce the risk of damage. In addition, the use of gaskets can also help improve the accuracy of pressure application and ensure the accurate alignment of the position of the object. It is also very convenient to replace or adjust the gasket, which can be operated according to different needs. This not only improves work efficiency, but also makes the gasket an indispensable auxiliary tool in the experiment or production process. Due to the excellent physical and chemical properties of sapphire, using it as a gasket can enhance the safety and accuracy of operation, and also provide more stable and reliable data for pressure measurement under various environmental factors.

[0068] In some embodiments, the sapphire gasket can be fixed in the center of the storage table by a variety of fixing methods. For example, it can be fixed by adhesive, which is a common fixing method. By using professional adhesives, such as BF glue, the sapphire gasket can be firmly fixed in the center of the storage table. Choosing a suitable adhesive is the key to ensure that it can withstand the pressure applied by the hydraulic press while maintaining the stability of the gasket. The advantage of using adhesives is that they are easy to install and suitable for gaskets of various shapes and sizes. Or a mechanical fixing structure is also a reliable fixing method. By designing specific mechanical parts such as buckles and screws, the sapphire gasket can be accurately fixed in the center of the storage table. This fixing method has high stability and can withstand greater pressure and vibration. Or it can also be hot pressing fixing, vacuum adsorption and other methods. The method of sapphire gasket can be selected according to actual conditions. No matter which fixing method is used, it is only necessary to ensure that the position of the sapphire gasket is accurate and stable, and can withstand the pressure applied by the hydraulic press while maintaining its long-term reliability and stability. When choosing a fixing method, factors such as the size, shape, use environment and cost of the gasket can be comprehensively considered. The fixing method of the sapphire gasket does not limit the scope of protection of this application, and can be selected based on actual needs. The embodiments of this application do not make specific limitations on this.

[0069] In some embodiments, the physical property parameters include descriptions of various physical properties of the substance, such as electrical conductivity, thermal conductivity, magnetic susceptibility, specific heat capacity, etc. These data reflect the physical behavior of the substance under specific conditions, such as temperature, pressure, and magnetic field.

[0070] Specifically, measuring the physical properties of a sample by the PPMS may include the following steps:

[0071] Step 1: Place the sample to be measured in the center of the rectangular sapphire, and then lead the electrodes from the sample using the preset four-lead method;

[0072] Among them, the electrodes can be led out by coating gold wire with silver glue, or directly attaching gold foil to the sample.

[0073] Step 2: Place the sapphire with the sample on it on the table at the bottom of the pressurizing device, and apply BF glue on the side of the sapphire to fix it;

[0074] Step 3, placing a lower pressure column, a gasket, a spring, a gasket, a pressure maintaining sleeve, and an upper pressure column in the pressurized chamber;

[0075] Among them, the surface of the lower pressure column is fixed with 2850FT black glue and round sapphire.

[0076] Step 4: Place the installed pressurizing device on the hydraulic platform and use the PPMS hydraulic press to apply pressure to the upper pressure column from the top of the pressurizing device;

[0077] Step 5: Every time the upper pressure column is pressed down, a corresponding part of the pressure maintaining sleeve is tightened;

[0078] The pressure applied by the hydraulic press can be calculated by the number of turns by which the pressure-maintaining sleeve is tightened, or can be directly determined by the pressure display data of the hydraulic press.

[0079] Step 6: After pressurizing to the required pressure, remove the upper pressure column, then install the PUCK simulation cover on the top of the pressure maintaining sleeve, and install the PUCK to the bottom of the pressurizing device through two bolt structures;

[0080] Step 7: Connect the electrodes from the sapphire to the PUCK in order to complete the connection of the test circuit;

[0081] The connection relationship between the electrode and PUCK can be as follows: Fig. 9 shown. Fig. 9 This is a schematic diagram of the sample test circuit connection in the embodiment of this application. Fig. 9 The PUCK in the above is Figure 3 PUCK31 shown in the figure. Fig. 9 The connection method shown can realize the four-lead method to simultaneously measure the resistance and longitudinal Hall signal of the sample.

[0082] Step 8, suck the PUCK simulation cover through the PPMS special sleeve, then put the whole device into the PPMS sample chamber, and measure the physical property parameters through PPMS;

[0083] Step nine, after the first test, if the pressure needs to be changed, fix the entire device on the pressure platform, remove the PUCK simulation cover, insert the upper pressure column, and then place the entire device under the PPMS hydraulic press to apply pressure.

[0084] In this way, after changing the pressure, you only need to remove the upper pressure column and then install the PUCK simulation cover to the top of the pressure maintaining sleeve. Then, through step eight, you can obtain the physical properties of the sample under different pressure conditions multiple times.

[0085] The pressurizing device provided by the utility model includes a pressurizing chamber and a pressure generating assembly; the pressurizing chamber has a channel capable of accommodating the pressure generating assembly, and a storage platform for placing the sample to be pressurized is provided at the bottom of the channel; the pressure generating assembly includes a lower pressure column, an elastic member, a pressure maintaining sleeve, and an upper pressure column sequentially arranged in the pressurizing chamber; the top of the pressurizing chamber is fixed by an internal thread and a pressure maintaining sleeve, and the upper pressure column can pass through the pressure maintaining sleeve and contact the elastic member; the size of the channel at the bottom of the pressurizing chamber matches the size of the lower pressure column, and can just accommodate the lower pressure column. In this way, the sample placed on the storage platform is always vertically downward due to the force of the lower pressure column, so that the out-of-plane pressure regulation of the sample is achieved.

[0086] The various embodiments in this specification are described in a progressive manner, and the same or similar parts between the various embodiments can be referenced to each other. Each embodiment focuses on the differences from other embodiments.

[0087] The above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit the present application. Although the present application has been described in detail with reference to the aforementioned embodiments, a person of ordinary skill in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some or all of the technical features thereof may be replaced by equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the present application.

Claims

1. A uniaxial pressurizing device, characterized in that: include: A pressurized chamber and a pressure generating assembly; The pressurizing chamber has a channel capable of accommodating the pressure generating assembly, and a placement table for placing the sample to be pressurized is provided at the bottom of the channel; The pressure generating assembly comprises a lower pressure column, an elastic member, a pressure maintaining sleeve and an upper pressure column which are sequentially arranged in the pressurizing cavity; The top of the pressurized cavity is fixed by an internal thread and the pressure maintaining sleeve, and the upper pressure column can pass through the pressure maintaining sleeve and contact the elastic member; the size of the bottom channel of the pressurized cavity matches the size of the lower pressure column and can just accommodate the lower pressure column.

2. The uniaxial pressurizing device according to claim 1, characterized in that: Gaskets are arranged at both ends of the elastic member, and the height of the gaskets can be adjusted.

3. The uniaxial pressurizing device according to claim 2, characterized in that: A first connection structure for connecting a sample holder of a physical property measuring instrument is disposed at the bottom of the pressurized cavity, and a second connection structure for installing a simulation cover of the sample holder is disposed at the top of the pressure maintaining sleeve.

4. The uniaxial pressurizing device according to claim 3, characterized in that: The top of the pressurized cavity is provided with an external thread, and the pressurized cavity can be fixed by the external thread and the pressure platform.

5. The uniaxial pressurizing device according to claim 4, characterized in that: When the uniaxial pressurizing device is fixed on the pressure platform, the bottom of the uniaxial pressurizing device is suspended in the air.

6. The uniaxial pressurizing device according to claim 5, characterized in that: A sapphire gasket is arranged between the sample and the storage table, and the sapphire gasket can be fixed in the center of the storage table; the sapphire gasket includes an upper sapphire and a lower sapphire, the lower sapphire is rectangular, the upper sapphire is circular, and the sample is placed on the lower sapphire.

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