A joint polarization system and method for piezoelectric single crystals under ultracurie temperature environment

Abstract

The application discloses a kind of piezoelectric single crystal's combined polarization system under super Curie temperature environment, comprising: the silicon oil heating furnace of placing to be processed piezoelectric material, controllable heating is executed to piezoelectric material.Signal generation module, corresponding electric field signal is generated and is applied to piezoelectric material located in silicon oil heating furnace.Temperature and voltage value in silicon oil heating furnace are monitored by monitoring module.Master control module is respectively connected with signal generation module and monitoring module signal, issues control instruction to signal generation module, and temperature and voltage are monitored in real time.AC and DC combined electric field is applied, AC and DC combined electric field is output by signal generator, and electric field is applied when sample temperature approaches Curie temperature, effectively optimize the domain structure of sample, significantly improve polarization effect.Silicon oil heating furnace is equipped with temperature control device, further improve polarization uniformity and the stability of domain structure.Real-time monitoring and data analysis, the polarization effect of sample is quantitatively evaluated.

Description

TECHNICAL FIELD

[0001] The application belongs to the field of domain engineering polarization of piezoelectric single crystal materials, and particularly relates to a combined polarization system and method for piezoelectric single crystals in a super-Curie temperature environment. BACKGROUND

[0002] Piezoelectric single crystals, represented by Pb(Mg1 / 3Nb2 / 3)O3-PbTiO3 (PMN-PT) relaxor ferroelectric single crystals, are a kind of extremely important functional materials, which can realize the conversion between mechanical energy and electrical energy. Compared with traditional piezoelectric ceramic materials, piezoelectric single crystals have ultra-high piezoelectric coefficients, excellent electromechanical coupling coefficients, and lower dielectric loss, showing unique technical advantages. With these excellent performances, relaxor ferroelectric single crystals have rapidly become the core materials in key electronic devices such as underwater acoustic transducers, ultrasonic transducers, precision actuators, resonators, and are widely used in industrial, medical, aerospace, military and other fields, making important contributions to the national economy and national defense construction.

[0003] In recent years, with the increasing demand for piezoelectric single crystal materials, the research on high-performance piezoelectric single crystals has gradually become a research hotspot in the field of materials science. Developing new single crystal materials with higher stability and better performance, optimizing the piezoelectric, dielectric and electromechanical coupling characteristics of existing materials, and revealing the mechanism of performance optimization are the keys to promoting the development of piezoelectric single crystal technology.

[0004] At present, a variety of performance optimization methods have been developed around piezoelectric single crystals, including exploring more solid solution systems and adjusting lattice defects through doping. However, these methods usually require changing the composition of the material or the manufacturing process, which is more complex and costly, limiting their widespread application. Based on this, the domain engineering technology developed in recent years provides an efficient and low-cost performance optimization method. Engineering technology adjusts the domain structure inside the material through post-processing methods without changing the chemical composition of the ferroelectric material, to achieve precise control of the dielectric and piezoelectric properties of piezoelectric single crystals.

[0005] Among them, alternating current polarization and field-cooled polarization as typical application methods of domain engineering technology have attracted widespread attention due to their significant effect on improving the performance of piezoelectric single crystals. Alternating current polarization makes the domain structure of the material more uniform by periodically changing the polarization electric field, thereby significantly improving the electromechanical properties of the material; while field-cooled polarization rearranges the domain structure by applying an electric field near the Curie temperature and slowly cooling, thereby effectively improving the piezoelectric coefficient and other key performance indicators. These methods have the advantages of wide application material range, significant performance improvement effect, simple operation and low cost, and are gradually becoming a hot spot in domain engineering research.

[0006] However, the current research on the combined polarization method under the super Curie temperature environment still has deficiencies. Especially in piezoelectric single crystals, the specific mechanism of field cooling polarization and its influence on material performance have not been deeply studied. In addition, how to combine alternating current polarization with field cooling polarization to further tap its potential in domain structure regulation and performance improvement is still a scientific problem to be solved. The patent proposes an innovative combined polarization system and method under super Curie temperature environment, which provides a new technical path for optimizing the comprehensive performance of piezoelectric single crystals. SUMMARY

[0007] The technical purpose of the present application is to provide a combined polarization system and method for piezoelectric single crystals under super Curie temperature environment, to study the combined polarization under super Curie temperature environment.

[0008] To solve the above problems, the technical scheme of the present application is as follows:

[0009] A combined polarization system for piezoelectric single crystals under super Curie temperature environment, comprising:

[0010] A silicone oil heating furnace configured to place piezoelectric materials to be processed and to perform controllable heating on the piezoelectric materials. During the heating process, the environmental temperature of the piezoelectric materials is maintained at the required polarization temperature.

[0011] A signal generation module configured to generate corresponding electric field signals to be applied to the piezoelectric materials located in the silicone oil heating furnace. The electric field signals include direct current electric field signals and alternating current electric field signals.

[0012] A monitoring module configured to monitor the temperature in the silicone oil heating furnace and the voltage value applied to the piezoelectric materials by the signal generation module, to obtain monitoring data.

[0013] A main control module connected to the signal generation module and the monitoring module, configured to issue control instructions to the signal generation module to control the signal generation module to generate direct current electric field signals or alternating current electric field signals and to control the voltage value. It is also configured to receive monitoring data from the monitoring module to monitor the temperature and voltage in real time.

[0014] The signal generation module includes a signal generator, a voltage amplifier, an upper electrode and a lower electrode.

[0015] The signal generator is connected to the main control module and is configured to receive control instructions from the main control module and generate electric field signals based on the control instructions.

[0016] The voltage amplifier is connected to the signal generator and is configured to amplify the amplitude of the electric field signals output by the signal generator.

[0017] Both the upper and lower electrodes are connected to the output signal of the voltage amplifier, and the upper and lower electrodes are respectively arranged on the upper and lower surfaces of the piezoelectric material, configured to apply the amplified electric field signal to the piezoelectric material.

[0018] The signal generator and the silicone oil heating furnace work together to generate a corresponding electric field signal, specifically:

[0019] When the silicone oil heating furnace heats the piezoelectric material to the Curie temperature, the signal generator generates an alternating electric field signal to pre-polarize the piezoelectric material, causing the domain structure to initially arrange itself.

[0020] When the silicone oil heating furnace heats the piezoelectric material at a constant temperature, the signal generator generates a DC electric field signal to achieve DC polarization of the piezoelectric material, which further orients the domain structure.

[0021] After polarization is completed, the domain structure is solidified by continuously generating a DC electric field signal by a signal generator during the temperature drop process through field cooling.

[0022] Specifically, the monitoring module includes a first voltage probe, a second voltage probe, and an oscilloscope;

[0023] The first voltage probe is connected to the upper electrode signal and is configured to monitor the voltage value at the upper electrode in real time; the second voltage probe is connected to the lower electrode signal and is configured to monitor the voltage value at the lower electrode in real time.

[0024] The oscilloscope is connected to the output terminals of the first voltage probe and the second voltage probe respectively, and is configured to receive voltage value related signals from the first voltage probe and the second voltage probe, thereby recording the voltage value change curve and feeding the data back to the main control module.

[0025] More preferably, the monitoring module also includes a temperature probe configured to monitor the temperature of the piezoelectric material in real time and feed the temperature data back to the main control module.

[0026] The main control module uses a computer and will also adaptively adjust the electric field signal of the signal generation module and the heating temperature of the silicone oil heating furnace based on the monitoring data of the monitoring module.

[0027] A joint polarization method for piezoelectric single crystals under ultra-Curie temperature conditions, adapted to the joint polarization system of piezoelectric single crystals under ultra-Curie temperature conditions as described above, includes the following steps:

[0028] The piezoelectric material is placed in a silicone oil heating furnace and gradually heated to near the Curie temperature;

[0029] An alternating electric field is applied by a signal generator to pre-polarize the piezoelectric material, so that the internal domain structure of the piezoelectric material is initially arranged.

[0030] While maintaining a constant temperature, the piezoelectric material is switched to a DC electric field to achieve DC polarization, thereby further modulating the domain structure.

[0031] After DC polarization is completed, the DC electric field is maintained through field cooling during the cooling process to solidify the domain structure;

[0032] Once the temperature drops to room temperature, stop applying the electric field, remove the polarized piezoelectric material, and complete the domain engineering polarization operation.

[0033] Among them, electric field and temperature data are monitored, and the changes in electric field strength and temperature during the polarization process are recorded by voltage probes, oscilloscopes, and temperature probes.

[0034] Because the present invention adopts the above technical solution, it has the following advantages and positive effects compared with the prior art:

[0035] This invention achieves the application of a combined AC and DC electric field, outputs the combined AC and DC electric field through a signal generator, and applies the electric field when the sample temperature is close to the Curie temperature, effectively optimizing the domain structure of the sample and significantly improving the polarization effect;

[0036] The silicone oil heating furnace is equipped with a temperature control device, which is combined with the field cooling process. After the temperature control device heats the sample to the Curie temperature range, the system achieves temperature field cooling through gradual cooling while maintaining the electric field applied, further improving polarization uniformity and domain structure stability.

[0037] Real-time monitoring and data analysis: Through the coordinated operation of voltage probes, oscilloscopes, and temperature probes, the system can monitor electric field, voltage, and temperature data in real time, ensuring stable and controlled polarization. The data is then aggregated and analyzed by a computer to quantitatively evaluate the polarization effect of the sample.

[0038] Improved sample performance: The polarization method provided by this invention significantly improves the piezoelectric constant, mechanical quality factor and other performance indicators of the sample, especially in high-power application scenarios. Attached Figure Description

[0039] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the invention.

[0040] Figure 1 This is a structural block diagram of the combined polarization system of piezoelectric single crystal under the super-Curie temperature environment of the present invention;

[0041] Figure 2 This is a structural block diagram of the combined polarization method for piezoelectric single crystals under the super-Curie temperature environment of the present invention;

[0042] Figure 3 This is a schematic flowchart of the combined polarization method for piezoelectric single crystals under the super-Curie temperature environment of the present invention.

[0043] Figure 4 This is a comparison diagram of the relative free permittivity of the piezoelectric single crystal after combined polarization and DC polarization according to the present invention;

[0044] Figure 5 This is a comparison diagram of the piezoelectric strain constants of the piezoelectric single crystal after combined polarization and DC polarization according to the present invention.

[0045] Explanation of reference numerals in the attached figures

[0046] 101: Main control module; 102: Signal generator; 103: Voltage amplifier; 104: Upper electrode; 105: Piezoelectric material; 106: Lower electrode; 107: Silicon oil heating furnace; 108: First voltage probe; 109: Oscilloscope; 110: Second voltage probe; 111: Temperature probe. Detailed Implementation

[0047] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the specific implementation methods of the present invention will be described below with reference to the accompanying drawings. Obviously, the drawings described below are merely some embodiments of the present invention. For those skilled in the art, other drawings and other implementation methods can be obtained based on these drawings without any creative effort.

[0048] To keep the drawings concise, only the parts relevant to the invention are shown schematically in each figure, and they do not represent the actual structure of the product. Furthermore, for ease of understanding, in some figures, only one of components with the same structure or function is shown schematically, or only one is labeled. In this document, "one" can mean not only "only one" but also "more than one".

[0049] The following detailed description, in conjunction with the accompanying drawings and specific embodiments, provides a further detailed explanation of the combined polarization system and method for piezoelectric single crystals under ultra-Curie temperature conditions proposed in this invention. The advantages and features of this invention will become more apparent from the following description and claims.

[0050] Piezoelectric single crystal materials, especially Pb(Mg1 / 3Nb2 / 3)O3-PbTiO3 (PMN-PT) relaxor ferroelectric single crystals, have become extremely important functional materials due to their excellent properties, and are widely used in the field of efficient conversion of mechanical energy to electrical energy. Compared with traditional piezoelectric ceramics, piezoelectric single crystals have higher piezoelectric constants, better electromechanical coupling performance, and lower dielectric losses, and have become core materials for electronic devices such as underwater acoustic transducers, ultrasonic transducers, and precision actuators, playing a key role in medical, industrial, aerospace, and defense fields.

[0051] With the increasing demand for high-performance piezoelectric single crystals, optimizing their performance has gradually become a research focus. Currently, performance optimization is mainly achieved through doping control, composition adjustment, and exploration of solid solution systems. However, these methods often require altering the material's composition and structure, resulting in complex processes and high costs, making large-scale application difficult.

[0052] To address the aforementioned issues, domain engineering technology has developed rapidly in recent years, providing a new approach for low-cost optimization of piezoelectric single-crystal performance. Domain engineering technology modulates the domain structure of materials by applying external electric and temperature fields, effectively improving piezoelectric and dielectric properties without altering the material's chemical composition. AC polarization and field-cooled polarization are typical domain engineering methods.

[0053] Alternating current polarization, through the application of a periodic electric field, makes the domain structure more uniform, which helps to improve the electromechanical properties of materials. Field cooling polarization, on the other hand, applies an electric field when the material is close to the Curie temperature, and uses a slow cooling process to promote domain rearrangement, significantly improving the piezoelectric constant and mechanical properties. These methods are simple to operate, inexpensive, and have the potential for wide application.

[0054] However, current research on combined polarization methods at Curie temperatures remains insufficient. Particularly in piezoelectric single crystals, the specific mechanisms of field-cooled polarization and its impact on material properties have not been thoroughly investigated. Furthermore, how to combine AC polarization with field-cooled polarization to further explore its potential in domain structure regulation and performance enhancement remains a pressing scientific problem.

[0055] Therefore, exploring the optimal polarization parameters of piezoelectric oscillator single crystal materials by optimizing and combining various domain structure polarization methods is very important for optimizing the performance of piezoelectric oscillator single crystal materials and expanding the practical applications of piezoelectric single crystals.

[0056] Example

[0057] See Figures 1 to 5Based on the above background, this embodiment provides a combined polarization system for piezoelectric single crystals under ultra-Curie temperature conditions, which mainly includes the following parts: a silicone oil heating furnace 107, a signal generation module, a monitoring module, and a main control module 101. The silicone oil heating furnace 107 is used to place the piezoelectric material 105 to be processed and to perform controllable heating on the piezoelectric material 105. During the heating process, the ambient temperature of the piezoelectric material 105 is maintained at the temperature required for polarization. The signal generation module is used to generate a corresponding electric field signal and apply it to the piezoelectric material 105 located in the silicone oil heating furnace 107; wherein, the electric field signal includes a DC electric field signal and an AC electric field signal. The monitoring module is used to monitor the temperature inside the silicone oil heating furnace 107 and to monitor the voltage value applied to the piezoelectric material 105 by the signal generation module, obtaining monitoring data. The main control module 101 is connected to the signal generation module and the monitoring module respectively. It is configured to issue control commands to the signal generation module to control the signal generation module to generate DC electric field signals or AC electric field signals and control the voltage magnitude. It is also used to receive monitoring data from the monitoring module to monitor temperature and voltage in real time.

[0058] See Figure 1 The main control module 101 uses a computer. The main control module 101 can control the operation of each module in the system. It can set polarization parameters through the main control module 101 and record and analyze various data in the polarization process in real time. Specifically, it can simultaneously acquire data from the oscilloscope 109 and the temperature probe 111 for analysis and recording.

[0059] See Figure 1 The signal generation module includes a signal generator 102, a voltage amplifier 103, an upper electrode 104, and a lower electrode 106.

[0060] The signal generator 102 is connected to the main control module 101 and receives control commands from the main control module 101. Based on these commands, it generates the AC / DC electric field signals required for DC-DC combined polarization. The amplitude and frequency of the electric field can be adjusted according to experimental requirements. Preferably, the signal generator 102 can output AC / DC combined electric fields with different amplitudes and frequencies according to set parameters to meet the requirements of different materials and polarization processes. The selection of the electric field amplitude and frequency depends on the physical properties of the material, polarization efficiency requirements, and thermo-electric behavior. Taking PMN-30PT material as an example, the AC electric field parameters for AC-DC combined polarization can be set to a symmetrical triangular wave with an amplitude of 7.5 kV / cm and a frequency of 0.1 Hz, applied for 10 cycles; the DC electric field is 7.5 kV / cm and is continuously applied during the sample cooling to room temperature. This parameter setting can effectively optimize the polarization effect, improve the dielectric and piezoelectric properties of the material, and avoid sample damage caused by changes in electric field or temperature.

[0061] The voltage amplifier 103 is connected to the signal generator 102 to amplify the electric field signal output by the signal generator 102, ensuring that the electric field strength acting on the piezoelectric material 105 meets the polarization conditions.

[0062] Both the upper electrode 104 and the lower electrode 106 are connected to the output of the voltage amplifier 103. The upper electrode 104 and the lower electrode 106 are respectively arranged on the upper and lower surfaces of the piezoelectric material 105 to uniformly apply the electric field to the surface of the piezoelectric single crystal sample, ensuring that the electric field is uniformly distributed inside the sample and achieving a stable polarization process.

[0063] The silicone oil heating furnace 107 is equipped with a temperature control device to heat the sample to its Curie temperature, for example, 131℃ for PMN-30PT relaxor ferroelectric material. Then, the sample is gradually cooled according to a preset cooling rate. The selection of the cooling rate must comprehensively consider the thermal stability and microstructural changes of the material to avoid stress concentration or cracking caused by excessively rapid cooling. For PMN-30PT material, the cooling rate should be controlled below 3℃ / min to ensure the stability of the cooling process and reduce the impact of thermal stress on the integrity of the sample structure, thereby improving the reliability and consistency of the polarization effect. Simultaneously with the temperature change, the signal generator 102 coordinates with the temperature change within the silicone oil heating furnace 107 to generate a corresponding electric field signal. Specifically, when the piezoelectric material 105 is heated to its Curie temperature in the silicone oil heating furnace 107, the signal generator 102 generates an AC electric field signal to pre-polarize the piezoelectric material 105, causing the domain structure to initially align. When the silicone oil heating furnace 107 heats the piezoelectric material 105 at a constant temperature, the signal generator 102 generates a DC electric field signal to achieve DC polarization of the piezoelectric material 105, thereby further orienting the domain structure. After polarization, the temperature is gradually reduced from the Curie temperature range at a set rate through field cooling. During this process, the signal generator 102 continuously generates a DC electric field signal, which is beneficial for the precise control and stable formation of the domain structure.

[0064] Specifically, the monitoring module includes a first voltage probe 108, a second voltage probe 110, and an oscilloscope 109. The first voltage probe 108 is signal-connected to the upper electrode 104 for real-time monitoring of the voltage value at the upper electrode 104; the second voltage probe 110 is signal-connected to the lower electrode 106 for real-time monitoring of the voltage value at the lower electrode 106. The oscilloscope 109 is signal-connected to the output terminals of the first voltage probe 108 and the second voltage probe 110, respectively, to receive voltage-related signals from the first voltage probe 108 and the second voltage probe 110, thereby displaying and recording the voltage change curve and feeding the data back to the main control module 101. This ensures the stability and accuracy of the applied electric field and reduces errors during the polarization process.

[0065] Preferably, the monitoring module further includes a temperature probe 111 for real-time monitoring of the temperature of the piezoelectric material 105 and feeding the temperature data back to the main control module 101 to ensure accurate temperature control. Preferably, based on the real-time temperature data fed back by the temperature probe 111, the main control module 101 can dynamically adjust the output power of the temperature control device to ensure that the sample temperature remains within a preset range.

[0066] Therefore, in this embodiment, the system uses a signal generator 102 and a voltage amplifier 103 to collaboratively output an electric field, which, in conjunction with a temperature control device, enables the field cooling polarization process of the sample within the Curie temperature range. A voltage probe and oscilloscope 109 are used to monitor changes in the electric field in real time, while a temperature probe 111 precisely controls the temperature conditions. Finally, data is collected and analyzed by a computer to evaluate the polarization effect and domain structure regulation performance of the sample. The specific analysis and evaluation methods include: using an impedance analyzer to measure the dielectric properties of the sample, such as the dielectric constant and loss factor, to quantify the changes in the dielectric properties of the material during polarization; and simultaneously, using a quasi-static piezoelectric constant measuring instrument to test the piezoelectric properties of the sample, such as the piezoelectric constant. This allows for a comprehensive characterization of the effect of polarization on enhancing and optimizing the piezoelectric properties of the samples. These test results provide crucial evidence for verifying the effectiveness of the polarization process and the improvement of material properties.

[0067] For a better option, see Figure 2 and Figure 3 This embodiment also provides a joint polarization method for piezoelectric single crystals under super-Curie temperature conditions, adapted to the joint polarization system of piezoelectric single crystals under super-Curie temperature conditions as described above, including the following steps:

[0068] The piezoelectric material 105 is placed in a silicone oil heating furnace 107 and gradually heated to near the Curie temperature. An alternating current electric field is applied through a signal generator 102 to pre-polarize the piezoelectric material 105, causing the internal domain structure of the piezoelectric material 105 to initially arrange. Under the condition of maintaining a constant temperature, a direct current electric field is switched to DC polarize the piezoelectric material 105, further regulating the domain structure. After DC polarization is completed, during the cooling process, the DC electric field is maintained by field cooling to solidify the domain structure. When the temperature drops to room temperature, the applied electric field is stopped, and the polarized piezoelectric material 105 is removed, completing the domain engineering polarization operation. During this process, electric field and temperature data are monitored, and the electric field strength and temperature changes during polarization are recorded using a voltage probe, an oscilloscope 109, and a temperature probe 111. The above method, through AC / DC combined polarization and field cooling processes, can effectively optimize the domain structure of piezoelectric single crystals and improve their dielectric, piezoelectric, and electromechanical coupling properties.

[0069] The operation process of this embodiment will now be described in conjunction with the above system and method:

[0070] First, sample preparation and system initialization:

[0071] The piezoelectric single crystal sample to be polarized is placed between the upper electrode 104 and the lower electrode 106 to ensure that the electrodes are in full contact with the sample surface in order to apply a uniform electric field.

[0072] Turn on the temperature control device and set the system temperature parameters to the Curie temperature range of the sample.

[0073] The main control module 101 initializes the parameters of the signal generator 102, voltage amplifier 103, and temperature control device, including the electric field type (DC, AC, or AC / DC combined electric field), electric field amplitude, frequency, temperature control heating rate, and cooling rate.

[0074] Then, heat to the Curie temperature:

[0075] The temperature control device activates the heating function to regulate the temperature of the sample.

[0076] Temperature probe 111 monitors the temperature change of the sample in real time and feeds the data back to the computer to ensure that the temperature gradually rises to the set Curie temperature range.

[0077] When the sample temperature is close to the Curie temperature, the system remains at a constant temperature to prepare for the application of the electric field.

[0078] Next, a combined AC and DC electric field is applied:

[0079] The start signal generator 102 outputs a preset AC / DC combined electric field signal, and the voltage is amplified to the set level by the voltage amplifier 103.

[0080] An electric field is uniformly applied to the piezoelectric material 105 through the upper electrode 104 and the lower electrode 106.

[0081] The voltage probe and oscilloscope 109 monitor the voltage changes of the upper and lower electrodes 106 in real time, calculate the electric field strength using the distance between the upper and lower electrodes 106, ensure the stability and accuracy of the applied electric field, and transmit the data to the computer for recording and analysis.

[0082] Entering the field cooling process:

[0083] While maintaining the applied electric field, the temperature of the piezoelectric material 105 is gradually reduced.

[0084] The temperature control device controls the temperature to gradually decrease according to the set cooling rate. The temperature probe 111 monitors the sample temperature in real time and feeds the data back to the computer to ensure that the temperature decreases steadily according to the preset curve.

[0085] The voltage probe and oscilloscope 109 continue to monitor the electric field response of the sample, recording voltage data and electric field distribution in real time.

[0086] At the same time, data collection and analysis are carried out:

[0087] Throughout the polarization process, the computer receives and records monitoring data from the temperature probe 111, voltage probe, and oscilloscope 109 in real time, including parameters such as temperature curves, electric field strength, and voltage changes.

[0088] After the polarization process is complete, the computer analyzes the collected data to evaluate the changes in the domain structure, polarization effect, and performance parameters of the sample.

[0089] Finally, the system stopped testing the sample.

[0090] When the temperature control device cools down to room temperature and the electric field application ends, the system automatically stops operating.

[0091] The polarized sample was removed for further performance testing and analysis to verify the improvement in piezoelectric properties. Figure 4 and Figure 5 As shown.

[0092] Through the above operation process, the system in this embodiment achieves precise domain engineering polarization of the sample under Curie temperature conditions using a combined AC and DC electric field, thereby optimizing the sample's domain structure and improving its piezoelectric properties. Simultaneously, the system's data monitoring and analysis functions allow for precise control and evaluation of the polarization process, thus improving the stability and repeatability of the polarization effect.

[0093] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings, but the present invention is not limited to the above embodiments. Even if various changes are made to the present invention, if these changes fall within the scope of the claims of the present invention and their equivalents, they shall still fall within the protection scope of the present invention.

Claims

1. A combined polarization system for piezoelectric single crystals under ultra-Curie temperature conditions, characterized in that, include: A silicone oil heating furnace is configured to hold piezoelectric materials to be processed and to perform controllable heating on the piezoelectric materials. During the heating process, the ambient temperature of the piezoelectric materials is maintained at the temperature required for polarization. The signal generation module is configured to generate a corresponding electric field signal and apply it to the piezoelectric material located in the silicone oil heating furnace; wherein the electric field signal includes a DC electric field signal and an AC electric field signal; The monitoring module is configured to monitor the temperature inside the silicone oil heating furnace and to monitor the voltage applied to the piezoelectric material by the signal generation module, thereby obtaining monitoring data. The main control module is connected to both the signal generation module and the monitoring module. It is configured to issue control commands to the signal generation module to generate a DC electric field signal or an AC electric field signal and to control the voltage magnitude. It is also configured to receive monitoring data from the monitoring module to monitor the temperature and voltage in real time.

2. The combined polarization system of piezoelectric single crystals under super-Curie temperature conditions according to claim 1, characterized in that, The signal generation module includes a signal generator, a voltage amplifier, an upper electrode, and a lower electrode; The signal generator is connected to the main control module and is configured to receive control commands from the main control module and generate an electric field signal based on the control commands. The voltage amplifier is connected to the signal generator and is configured to amplify the amplitude of the electric field signal output by the signal generator. Both the upper electrode and the lower electrode are connected to the output of the voltage amplifier, and the upper electrode and the lower electrode are respectively arranged on the upper and lower surfaces of the piezoelectric material, configured to apply the amplified electric field signal to the piezoelectric material.

3. The combined polarization system of piezoelectric single crystals under super-Curie temperature conditions according to claim 2, characterized in that, The signal generator and the silicone oil heating furnace work together to generate a corresponding electric field signal, specifically: When the silicone oil heating furnace heats the piezoelectric material to the Curie temperature, the signal generator generates an alternating electric field signal to pre-polarize the piezoelectric material, causing the domain structure to initially arrange itself. When the silicone oil heating furnace heats the piezoelectric material at a constant temperature, the signal generator generates a DC electric field signal to achieve DC polarization of the piezoelectric material, thereby further orienting the domain structure. After polarization is completed, the domain structure is solidified by continuously generating a DC electric field signal by the signal generator during the temperature drop process through field cooling.

4. The combined polarization system of piezoelectric single crystals under super-Curie temperature conditions according to claim 2, characterized in that, The monitoring module includes a first voltage probe, a second voltage probe, and an oscilloscope; The first voltage probe is connected to the upper electrode signal and is configured to monitor the voltage value at the upper electrode in real time. The second voltage probe is connected to the lower electrode signal and is configured to monitor the voltage value at the lower electrode in real time; The oscilloscope is connected to the output terminals of the first voltage probe and the second voltage probe, respectively, and is configured to receive voltage value related signals from the first voltage probe and the second voltage probe, thereby recording the voltage value change curve and feeding the data back to the main control module.

5. The combined polarization system of piezoelectric single crystals under super-Curie temperature conditions according to claim 1, characterized in that, The monitoring module also includes a temperature probe, which is configured to monitor the temperature of the piezoelectric material in real time and feed the temperature data back to the main control module.

6. The combined polarization system of piezoelectric single crystals under super-Curie temperature conditions according to claim 1, characterized in that, The main control module is a computer, and it also adaptively adjusts the electric field signal of the signal generation module and the heating temperature of the silicone oil heating furnace based on the monitoring data of the monitoring module.

7. A method for joint polarization of piezoelectric single crystals under super-Curie temperature conditions, adapted to the joint polarization system of piezoelectric single crystals under super-Curie temperature conditions as described in any one of claims 1 to 6, characterized in that, Includes the following steps: The piezoelectric material is placed in a silicone oil heating furnace and gradually heated to near the Curie temperature; An alternating electric field is applied by a signal generator to pre-polarize the piezoelectric material, so that the internal domain structure of the piezoelectric material is initially arranged. While maintaining a constant temperature, the piezoelectric material is switched to a DC electric field to achieve DC polarization, thereby further modulating the domain structure. After DC polarization is completed, the DC electric field is maintained through field cooling during the cooling process to solidify the domain structure. Once the temperature drops to room temperature, stop applying the electric field, remove the polarized piezoelectric material, and complete the domain engineering polarization operation. Among them, electric field and temperature data are monitored, and the changes in electric field strength and temperature during the polarization process are recorded by voltage probes, oscilloscopes, and temperature probes.

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