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Method for regulating and controlling electrical properties of La2Ti2O7

A technology with electrical properties and diamond counter-anvils, applied in scientific instruments, material capacitance, preparation of test samples, etc., can solve the problems of high technical difficulty, high cost, low success rate, etc., to improve stability and energy. Effect

Inactive Publication Date: 2020-11-13
JILIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Traditional Improvement La 2 Ti 2 o 7 The method of electrical properties is mainly realized through the preparation process and doping. These methods need to control the reaction time and control the doping concentration, which is technically difficult, high in cost and low in success rate.

Method used

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  • Method for regulating and controlling electrical properties of La2Ti2O7
  • Method for regulating and controlling electrical properties of La2Ti2O7
  • Method for regulating and controlling electrical properties of La2Ti2O7

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Level and center the diamond anvil device, select T301 steel sheet pre-pressed as the gasket, punch the gasket and insulate the gasket, use cubic BN as the insulating powder, and add the insulating powder to the gasket. Press, and then punch a hole in the pressed insulating powder to make a sample cavity, arrange two electrodes on the diamond anvil, and put La 2 Ti 2 o 7 The powder was thoroughly ground for 2 minutes and the sample was added in a diamond-anvil-sealed sample chamber. The ruby ​​fluorescence peak is used as the calibration object of the pressure. The pressure is applied to the inside of the sample chamber of the diamond-anvil device, and the in-situ high-voltage impedance spectroscopy test is carried out.

[0022] The internal pressure of the sample cavity of the diamond anvil device is changed within the range of 0-2.0GPa, and the pressure points of 0GPa, 0.47GPa, 0.88GPa, 1.62GPa, 2.0GPa are taken in this pressure range to test the in-situ high-volta...

Embodiment 2

[0025] Slowly increase the internal pressure of the diamond anvil device sample from 3.0GPa to 7.92GPa, and take 3.0GPa, 4.02GPa, 5.78GPa, 7.92GPa and other pressure points within this interval to test the in-situ high-voltage impedance spectrum of the sample. For specific test results, see image 3 .

[0026] The electrochemical impedance spectrum was analyzed, and the corresponding equivalent circuit model was established, and the experimental data of 5.78GPa was selected for fitting. For specific fitting results, see Figure 4 .

Embodiment 3

[0028] Slowly increase the internal pressure of the sample cavity of the diamond anvil device from 7.92GPa to 30.0GPa, and take pressure points such as 8.95GPa, 10.45GPa, 15.17GPa, 16.51GPa, 20.4GPa, 30.0GPa in this range to test the in-situ high-voltage impedance spectrum . For specific in situ impedance spectra, see Figure 5 .

[0029] The electrochemical impedance spectrum was analyzed, and the corresponding equivalent circuit model was established, and the experimental data of 16.51GPa was selected for fitting. For specific fitting results, see Image 6 .

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Abstract

The invention discloses a method for regulating and controlling electrical properties of La2Ti2O7, and belongs to the technical field of high-voltage regulation and control of electrical properties. Under room temperature conditions, the method is carried out in a diamond anvil cell. Two electrodes are arranged on a diamond anvil cell, a sample is added into a sealed sample cavity of the diamond anvil cell, a diamond anvil cell device is started to enable the internal pressure of the sample cavity to be gradually increased, an in-situ impedance spectroscopy test is carried out, and a change curve of La2Ti2O7 electrical parameters along with the pressure is obtained through equivalent circuit fitting. The invention provides a new method capable of regulating and controlling the electrical properties of La2Ti2O7, so as to meet the requirements of different piezoelectric elements on different electrical properties of materials, and provide a new direction for the application of La2Ti2O7 in the technical field of electronic component manufacturing.

Description

technical field [0001] The invention belongs to the technical field of high-voltage regulation and control of electrical properties, and in particular relates to a method for regulating and controlling La 2 Ti 2 o 7 methods of electrical nature. Background technique [0002] A 2 B 2 o 7 Perovskite structure material is a new type of artificially synthesized functional ceramic powder, which can be used as piezoelectric material. But A 2 B 2 o 7 The low resistivity of ceramics is not satisfactory in practical applications, which leads to the instability of the output signal of the sensor, and the charge flows away in the form of leakage without being detected by the sensor. Resistivity, as an important parameter for the application of ceramics in electronic components, should receive special attention. Especially under high-voltage conditions, the resistivity of piezoelectric ceramics has a significant impact on leakage and dielectric loss. High resistance can reduce...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N1/28G01N27/04G01N27/22
CPCG01N1/28G01N27/041G01N27/221
Inventor 韩永昊赵淼吕鹏飞韩涛高春晓
Owner JILIN UNIV
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