91 results about "Diamond anvil cell" patented technology

The invention discloses a method for measuring dielectric properties of diamond anvil cells in situ and belongs to the technical field of electromagnetic measurement under high voltage. The method comprises the following steps of firstly, assembling the diamond anvil cells, i.e. respectively forming round electrodes on the anvil surfaces of two diamond anvil cells, wherein an insulating layer is arranged on the inner side wall of a sample cavity of a composite insulating cushion; secondly, performing measurement, i.e. using a frequency response analysis meter to obtain relation patterns between an impedance real part and an impedance virtual part under different pressures; and finally, performing data processing, i.e. using Zview software and an electromagnetic metering formula related to dielectric properties to obtain the relative dielectric constant epsilon r, the dielectric constant real part epsilon', the dielectric constant virtual part epsilon'', the loss tan theta and the like. The shapes and the positions of the electrodes are fixed, and meanwhile, correction is performed because of the influence of fringe effect on a measuring result; and the prepared composite insulating cushion ensures complete insulation of the inner wall of a voltage cavity, so that the method for precisely measuring the dielectric properties of a material in situ under high voltage is realized.

The invention discloses an in-situ electrical measuring electrode that is used in diamond-pair anvil cells and a manufacturing method thereof, and belongs to the technical field of high-temperature and high-voltage devices. Four electrodes (1) are deposited on the surface of a diamond anvil cell (8) and distribute from an anvil surface to a lateral surface of the diamond anvil cell (8); the electrodes (1) are diamond films doped with boron; a diamond insulating layer (2) covers the anvil surface and the lateral surface of the diamond anvil cell (8) as well as the electrodes (1) thereof; the electrodes (1) are exposed at one end of the anvil surface, the exposed position lies inside a sample cavity (9), and the electrodes (1) are exposed at one end of the lateral surface and connected with an electrode lead (5). A diamond film microcircuit and the diamond insulating layer are simultaneously integrated onto the surface of the diamond anvil cell by utilizing the film deposition technique, the nanometer seeding technique, the masking technique and the photolithographic method. The manufacturing method of the in-situ electrical measuring electrode prevents the electrode from being destroyed by transverse shearing force and overcomes the electrode corrosion by samples under the high-voltage condition, thus widening the research field of electrical in-situ measurement under high voltage.

The invention discloses an inner-condensing diamond anvil cell pressing machine and belongs to the technical field of an in-situ physical quantity measurement device at high temperature and high pressure. The device comprises a pressing machine made of high-strength alloy steel (1) and beryllium copper (2), one pair of diamond anvil cells (5), a rocking bed (4) among the pressing machine and the diamond anvil cells (5), a mica sheet (3) between the pressing machine and the rocking bed (4), a spacer (6) between the two diamond anvil cells (5), spiral heater strips (7) wound on the spacer (6), a thermoelectric coupler (8), pneumatic fast joints (9) connected with a circulating water cavity (10) and a water pipe in the pressing machine, an external water-cooling machine and a water pump. The pressing machine is heated by the spiral heater strips and cooled by circulating water so that the high-temperature environment can be provided for the sample, and the pressing machine can be retained at a normal temperature status without pressure loss; a testing device for in-site measurement of multiple physical quantities at a high-temperature and high-pressure extreme condition and a testing method for the in-site measurement are established.

The invention provides an apparatus and method for detecting the size and refractive index of a material in a diamond anvil cell. The apparatus and method of the invention are applicable to the research of the refractive index under high pressure and high-pressure equation of state of a material. The apparatus comprises a broadband light source; the apparatus further comprises a cubic prism; a converging objective lens and a triangular prism are sequentially arranged on two emergent light paths of the cubic prism; an area-array detector is arranged behind the cubic prism; a reflector is arranged on the emergent light path of the triangular prism; a diamond anvil cell is arranged on the emergent light path of the converging objective; the diamond anvil cell is connected with a first displacement mechanism; and the reflector is connected with a second displacement mechanism. According to the apparatus and method of the invention, only one set of interference measurement device is used, the real-time thickness and refractive index of a sample can be calculated out with one step, and based on area array imaging characteristics, the volume of the sample can be obtained, and therefore, an extra monochromatic light interference device is not required to be adopted; a measurement process is simple, and the measurement of the parameters of the material under high pressure can be facilitated, and can be realized with easiness. The apparatus and method of the invention have great market application value in fields such as energy and material fields.

The invention relates to a measuring method of the magnetic resistivity of a substance under the condition of high voltage, belonging to the technical field of measurement of physical quantities. The magnetic resistivity of the substance is measured on diamond anvil cells of a metal film electrode (13) on the basis of the van der pauw resistance measurement method according to the following test steps of: assembling equipment; regulating a magnetic field; carrying out the in-site measurement of magnetic field strength; measuring the magnetic resistivity; and the like. The metal film electrode (13) is deposited on one the used diamond anvil cells; a pressing machine (5) and a spacer (4) are both made of nonmagnetic materials; and only a shaking table (2) is made of steel materials. The invention mainly obtains the technical effect of accurately measuring the magnetoresistance effect of a sample under the condition of the high voltage, establishes a nonmagnetic measurement environment, provides a uniform magnetic field on space for the sample, eliminates the influences of lead resistance and contact resistance and carries out the in-site measurement on the magnetic field strength inside a cavity of the sample; and in addition, the used metal electrode (13) can bear high pressure without being cut easily.

The invention relates to a measuring system and measuring method of the Curie temperature of a substance under high pressure. In the system, a sample is placed in a sample cavity in the center of a metal gasket of a diamond anvil cell, and the sample is compacted by two diamonds of the diamond anvil cell; the light beam of a laser device is focused to the sample through the diamond anvil cell; an excitation coil is connected with two electrodes of an alternating current source, and an induction coil is arranged on one diamond of the diamond anvil cell in a sleeved mode and is close to the sample; a compensating coil and the induction coil are arranged in parallel in the excitation coil and are reversely connected in series; a lock-in amplifier is provided with reference signals by the alternating current source, and simultaneously receives, amplifies and detects the magnetic induction signals of the induction coil and the compensating coil; a sample temperature measuring device is arranged in a position close to the sample; and the outputs of the lock-in amplifier and the sample temperature measuring device are connected to a signal acquisition and processing device. The measuring system and measuring method realize measurement of the Curie temperature point of the substance under high pressure, and widen the range of measurable parameters by magnetic measurement under high pressure.

The invention relates to the field of ultrahigh pressure physical experiments, and concretely relates to a diamond anvil cell sample locking apparatus and a monitoring method thereof. The diamond anvil cell sample locking apparatus comprises a diamond anvil cell for locking a sample and a driving device for driving the diamond anvil cell to enforce compacting motion, and a force sensor used for measuring driving force is arranged between the driving device and the diamond anvil cell. The apparatus can acquire and monitor the diamond anvil cell pressure application condition of the driving device through the force sensor, and can judge that whether the driving device continuously applies pressure or not according to the driving force condition acquired by the force sensor, such as the pressure application can be stopped when the diamond anvil cell sample locking initial driving force reaches preset driving force.

The invention relates to electrodes for a high pressure in situ resistivity survey and a manufacturing method of the electrodes and belongs to the field of high pressure apparatus technology. Two electrodes (3) are deposited on a diamond anvil cell (1), an insulation protection layer (4) is redeposited on an anvil face and a side face of the diamond anvil cell (1), and metal leads (5) of the electrodes are adhered to electrode terminals exposed barely on the side face of the diamond anvil cell (1); the terminals of the two electrodes (3) on the anvil face of the diamond anvil cell (1) are circular and arched in shape respectively; and a metallic gasket (6) disposed between two diamond anvil cells (1) serves as the third electrode. The manufacturing method of the electrodes (3) comprises the steps of depositing metal molybdenum, manufacturing electrodes, depositing the aluminium oxide insulation protection layer and manufacturing the electrode leads. By employing the electrodes, the resistivity survey is free from experimental errors caused by uninsulated cavity inner walls of samples, and requires no measurement of thicknesses of the samples, thereby being free from the experimental errors caused by inaccurate thickness measurement.

The invention discloses a small-size rotating type diamond anvil cell press device, and belongs to the technical field of physical quantity in-situ measuring devices under high-temperature high-pressure conditions. The small-size rotating type diamond anvil cell press device structurally comprises a rotating rod inserting hole (1), ball bearings (2), pressurizing screws (3), belleville springs (4), an upper outer press cylinder (5), an inner press piston (6), a lower outer press cylinder (7), fastening screws (8), diamond anvils (9), a spacer (10), a sample cavity (11), support blocks (12), a scale disc (13), a rotating rod (14) and scale disc lines (15). The small-size rotating type diamond anvil cell press device is simple in structure and small in size, vertical pressurization, rotational pressurization or simultaneous vertical rotation and pressurization can be achieved, an upper anvil and a lower anvil can be rotated for any angle relative to each other, and a shearing function can be effectively adjusted.

The invention discloses a dynamic loading device based on a symmetrical diamond anvil cell technology. The dynamic loading device comprises a carrier, a symmetrical DAC (diamond anvil cell), a plurality of piezoelectric ceramics and static pressure loading screws, wherein the carrier comprises an upper cover and a sleeve; the upper cover is in a circular plate shape; the sleeve is cylindrical; a groove is formed in the center of the top of the sleeve and used for loading the symmetrical DAC; a piston part of the symmetrical DAC and the sleeve of the carrier are fixed by screws; a plurality of perforated piezoelectric ceramic filling holes and a plurality of static pressure loading threaded mounting holes are centrally symmetrically distributed at the bottom of the sleeve of the carrier in a loading axis direction; light holes are formed in the centers of the upper cover and the sleeve of the carrier; the piezoelectric ceramics are columnar and parallel to an axis of the sleeve; the piezoelectric ceramics are fixedly arranged in the filling holes at the periphery of the sleeve; the lower ends of the piezoelectric ceramics are fixed in the filling holes at the periphery of the is fixed via fixing screws; and the upper ends of the piezoelectric ceramics are contacted with the bottom surface of the upper cover. The device is an experimental device capable of using the symmetrical DAC and testing quick loading/unloading; an operation process of an experiment is simplified; a use rate of the device is increased; and the experiment difficulty is reduced.

The invention relates to a diamond anvil cell zirconium-base amorphous alloy seal pad which comprises the following chemical components in atomic percents (at.%): 55-66% of Zr, 8-11% of Al, 5-19% of Ni and 7-30% of Cu. The preparation method comprises the following steps: putting the raw materials into a non-consumable arc-melting furnace, heating to 2000 DEG C to smelt to form an alloy ingot, repeatedly smelting 2-7 times, putting the alloy ingot into a silica tube, heating for resmelting in a high-frequency electromagnetic induction furnace, injecting into a copper mold filled with a copper wire core, cooling in an argon atmosphere, separating the copper mold, and taking out the copper wire core to obtain the amorphous alloy seal pad. The amorphous seal pad is filled into a diamond anvil cell to align the sample cavity with the center of the anvil table, and then the sample, a pressure transfer medium and a scalar pressure medium are put into the sample cavity to carry out pressurization and depressurization experiments. The invention is simple to operate, does not need to make a hole, eliminates the influence of the back bottom on the experimental result, and enhances the reliability and precision of the experimental result.

The invention provides a diamond anvil cell sample temperature measuring method, and belongs to the technical field of temperature measurement under high temperature and high pressure. Firstly diamondanvil cells are assembled; thermocouples are arranged on the designated positions of the bottom surface and the side edges of two diamond anvil cells to read the temperature of the corresponding points; and then fitting calculation of the temperature gradient is performed: a finite element model is established according to the real experimental size, the bottom surface temperature of the diamondanvil cells measured by the experiment acts as the thermal boundary condition to be inputted to the finite element model, the anvil face input temperature of the two diamond anvil cells is changed until the simulation temperature of the temperature measuring points of the side edges if fit with the temperature read by the experiment, and then the anvil face input temperature of the diamond anvil cells is the real experimental temperature and is also the sample surface temperature. The method is simple, easy to implement and great in experimental repetition so that the problem that the thermocouples cannot be conveniently arranged because of the small size of the sample chamber can be solved; and the experimental error caused by substituting the sample temperature by the side edge temperature of the diamond anvil cells can be compensated.

The method of measuring the thickness of the sample on the top anvil by the adamas pertains to the field of physical quantity testing technology. The testing steps are: the height of the two pieces of adamas measuring the top anvil in the normal atmosphere pressure is HO; the intensity of pressure P and the thickness TL (P) of the adamas and the sample is measured to obtain the corresponding data in the pressurizing process; when the biggest value is achieved, the pressure is going to be relieved and the intensity of pressure P and the thickness TD(P) of the adamas and the sample is measured to obtain the corresponding data in the pressure relieving process; the thickness of the adamas and the sample is TD(0) when the measured pressure is reduced to the normal atmosphere pressure; the curve TL(P) ~P and TD(P)~P are fitted in a same frame of axes; the thickness t(P) of the sample in a random pressure P is calculated by the formula of t(P)=TD(0)-H0+TL(P)-TD(P). The factors that influence the measuring of the thickness of the sample on the top anvil by the adamas are eliminated by simple and effective design and the problem of measuring the thickness that puzzles the research man of the high pressure is solved.

The invention discloses a method for preparing a metal electrode on a diamond anvil cell. The method is that an electrode structure which is 10 microns in width is prepared on a round diamond anvil cell surface of which the diameter is 300 microns; and the method comprises the steps as follows: a hollow metal mask with an electrode pattern structure is prepared; the hollow metal mask and the diamond anvil cell surface are aligned and fixed, so that the hollow metal mask covers the surface of the diamond anvil cell surface; a metal electrode is sputtered on the surface of the diamond anvil cell surface with the hollow metal mask; and the hollow metal mask is removed. Preparation of the metal electrode on the diamond anvil cell is finished by an ultraviolet lithography technology, an alignment technology and an ion beam sputter coating technology; the electrode structure which is 10 microns in width can be prepared on the round diamond anvil cell surface of which the diameter is 300 microns; the method is simple to operate; the lithography process on the diamond anvil cell surface in a traditional technology is avoided; and the method is simple in process and easy to operate.

The invention provides an optical system and a fluorescence measurement and pre-positioning method thereof. The optical system comprises a positioning platform, a laser source, an illuminating light source, a control unit, a dichroscope, a semi-reflection mirror, a beam splitter, an image pickup unit and a display unit. The method comprises the following steps: positioning a first position by laser, wherein the display position of the cross point of cross hairs in the display unit is the first position; placing a diamond anvil cell on a positioning platform; moving the positioning platform so that the display position of ruby in a diamond anvil cell sample cavity in the display unit is the first position to finish fluorescence measurement; recording the coordinates of the positioning platform; and finally, correcting the recorded coordinates according to the diamond refractive index in the diamond anvil cell. In the invention, pressure measurement and pre-positioning of the diamond anvil cell sample cavity can be realized, the calibration of pressure of the sample cavity depending on a Raman spectral system is avoided, and the positioning time of a diamond anvil cell sample cavity experiment by an X-ray diffraction system is shortened.

The invention provides four-axis linkage pressurized equipment based on a diamond anvil cell press. The situation can be achieved through the following technical scheme that four motors are utilized to link to rotate a pressurized bolt simultaneously, the same torque is input to apply hydrostatic pressure on a testing sample, the disadvantageous factors on the sample caused by non-uniform pressurein a material step-by-step pressurizing mode are overcome, a sample cavity is protected, and the experimental success rate is improved. The equipment is composed of a pressure sensing module, a pressurizing module, a machine frame and a control system; the machine frame is composed of a polish rod, a bearing plate and a bearing; the pressure sensing module comprises a servo motor, a lead screw and a lead screw nut; the pressurizing module comprises four stepping motors, an internal hexagonal wrench and four sets of gear pairs; and the control system controls the pressure sensing module and the pressurizing module. Compared with the prior art, the equipment has the advantages that the equipment achieves simultaneous precession of diamond anvil cell press bolts, the unfavourable problems such as sample cavity shrinkage, displacement, sample side overflow and diamond damage caused by non-uniform pressure in the traditional manual pressurization process are avoided, and the reliability ofthe experiment is improved.

The invention belongs to the technical field of neutron diffraction, and relates to a molybdenum-titanium alloy neutron transparent material used for a neutron diffraction high-pressure cavity sealing pad and a preparation method thereof. The molybdenum-titanium alloy neutron transparent material comprises 46 wt%-56 wt% of molybdenum and the balance titanium. Compared with an existing Ti-Zr alloy sealing pad, the molybdenum-titanium alloy neutron transparent material is high in strength and capable of improving the pressure of a high-pressure cavity and increasing the quantity of high-pressure experiment samples; the neutron transmittance of the molybdenum-titanium alloy neutron transparent material is high, the neutron diffraction performance of the molybdenum-titanium alloy neutron transparent material is equivalent to that of Ti-Zr alloy, but the adhesion of the molybdenum-titanium alloy neutron transparent material to diamond is very low; and a diamond anvil cell is easy to clean after a high-pressure experiment, the service life of the diamond anvil cell can be prolonged, and the high-pressure experiment cost is reduced.

The invention discloses a device for measuring high temperature and high pressure transport properties based on diamond opposed anvils, and belongs to the technical field of physical quantity in-situmeasuring device under extreme conditions. The device comprises a press machine upper die (1), a press machine lower die (11), and diamond anvil cells (2); a metal gasket (6) is clamped between the two diamond anvil cells, and two diamond anvil cells are fixed on a support block (4) and a rocking bed (5) respectively; a rocking bed base (7) is placed at the bottom of the rocking bed, and a rockingbed cover (8) is placed at the upper part of the rocking bed; mica pieces (9) are placed between the support block and a press machine, and between the rocking bed base and the press machine respectively; a prepared ceramic die (3) is fixed in a step trough of the support block, and a ceramic die (13) sleeves the rocking bed. A sample (10) is guaranteed to be in a high temperature and high pressure environment, on the basis of easy operation and overcoming of the damage of high temperature on the press machine and the loss of pressure due to high temperature, the high temperature and high pressure transport properties of the sample are measured, and favorable conditions are provided for in-situ measurement of multiple physical quantities under the extreme conditions.

The invention belongs to the technical field of gas trace liquefying encapsulation in a diamond anvil cell pressing machine and relates to a diamond anvil cell pressing machine trace gas liquefying plant. The diamond anvil cell pressing machine trace gas liquefying plant comprises a cavity outer sleeve (1), an upper cover (2) and a low-temperature chamber (4), wherein the low-temperature chamber (4) is mounted in an opening in the middle of the upper cover (2); the upper cover (2) is provided with a liquid nitrogen inlet (3) and a liquid nitrogen outlet (6); the space enclosed by the outer sleeve (1), the upper cover (2) and the low-temperature chamber (4) is a liquid nitrogen chamber (8); the diamond anvil cell pressing machine is disposed in the low-temperature chamber (4), and a gas inlet (5) is formed in the lateral side of the low-temperature chamber (4) and can be communicated with a sample chamber in the diamond anvil cell pressing machine. The diamond anvil cell pressing machine trace gas liquefying plant has the advantages that the liquid nitrogen is used to cool the low-temperature chamber (4) and the diamond anvil cell pressing machine, and when temperature reaches the liquefying temperature of encapsulation gases, the gases are injected into the sample chamber; liquefied gases are saved greatly as compared with the prior art, and potential safety hazards of inflammable and explosive gases can be eliminated.

The present invention discloses a method for in-situ measurement of material thermoelectric properties in a diamond anvil cell (DAC). The method comprises the steps of: the step 1, manufacturing of heat-isolating and insulated composite pad; the step 2, deposition of a W-Ta thin film thermocouple on a surface of the DAC; the step 3, performing Seebeck coefficient measurement of a measured sample in a high voltage; and the step 4, performing conductivity measurement of the sample in the high voltage. Though the DAC is employed in the prior art to allow people to observe structures of substancesand change of physical properties in an ultrahigh voltage environment, lots of semiconductor materials can generate reduction of energy bands and increasing of a conductivity in a high voltage, and therefore, a superexcellent experiment means is provided for improving the thermoelectric properties of the semiconductor materials. In the prior art, there is no a set of developed measurement methodfor measurement of thermoelectric properties of samples in the DAC, so that the technical problems cannot be solved that the thermoelectric properties of the materials cannot be simply and conveniently tested in the prior art.

The invention discloses a method for enhancing the photocatalysis property of LiTaO3, and belongs to the technical field of photocatalysis materials. In a diamond anvil cell, a T301 steel sheet is selected as a gasket material, silicone oil is used as a pressure transmission medium, and a ruby fluorescence peak is used as a calibration object of pressure; and after the gasket is punched, a LiTaO3sample is placed into a closed sample cavity formed by the anvil face of the diamond anvil cell and the gasket, and a pressure of 1-10GPa is applied to the interior of the cavity by utilizing the anvil cell device sample of the diamond anvil cell to obtain the LiTaO3 material with enhanced photocatalytic activity. The LiTaO3 material can be applied to a microbial fuel cell as a cathode catalyst, organic matters in water or sludge can be degraded at the same time, and electrons generated by the organic matters in the microbial metabolism process are converted into current, so that electric energy is obtained.

The invention relates to high-voltage experimental equipment, and provides a diamond anvil cell device which comprises a press cylinder upper die and a press piston lower die. A plurality of upper supporting wings are arranged on the side wall of the press cylinder upper die, upper pressing screw holes are formed in the upper supporting wings in an axially penetrating manner, lower supporting wings in one-to-one correspondence to the upper supporting wings are arranged on the side wall of the press piston lower die, lower pressing screw holes in one-to-one correspondence to the upper pressingscrew holes are formed in the lower supporting wings in an axially penetrating manner, first tapered holes are formed in the press cylinder upper die and the press piston lower die in an axially penetrating manner, a diamond anvil cell is embedded into the top of each first tapered hole, two opposite upper half tapered holes are formed in the side wall of the press cylinder upper die, lower half tapered holes in one-to-one correspondence to the upper half tapered holes are formed in the side wall of the press piston lower die, and each upper half tapered hole and the corresponding lower half tapered hole enclose a second tapered hole leading to the corresponding diamond anvil cell. The diamond anvil cell device is small in size and light in weight, and axial and radial working distances can be remarkably shortened.

The invention discloses a diamond anvil cell heating gasket and a preparation method thereof, and belongs to the technical field of physical quantity measurement under extreme conditions. The structure comprises a metal steel sheet I (1), a mica sheet III (6), a metal rhenium sheet (7), a mica sheet IV (8), high-temperature-resistant insulating cement (10), heating body metal platinum (11), an aluminum oxide heat insulating layer (12), a sample cavity (13) and the like which are bent into a U shape. According to the method, the early-stage investment is small, the operation is easy, the lasting and stable temperature control and heating aging in the pressure cavity and the high heating temperature limit are achieved, the small conduction heating effect of the diamond anvil cell is achieved, and the oxidative damage to the diamond anvil cell is effectively restrained.

The invention discloses a method for measuring the phase transition of a substance under high static pressure. A short-wavelength X-ray diffraction method is adopted to measure the structural phase transition of the substance of a diamond anvil cell under high pressure. According to the method, high energy and high penetrability of short-wavelength X rays are utilized to realize X-ray diffraction of the material in the diamond anvil cell. The method has the characteristics that the testing efficiency and the testing precision are improved, a good experimental technological method is provided for high pressure researchers, the method is particularly suitable for phase transition research of high atomic numbers under high pressure and can provide a new way for the X-ray diffraction experiment under high pressure in a common experiment room.