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Method for restraining leakage conductance of barium zirconate titanate ceramic

A technology of barium zirconate titanate and ceramics, which is applied in the field of ferroelectric ceramic material preparation, can solve problems such as the increase of coercive electric field, the influence of BZT ferroelectricity, and strong leakage conduction, so as to suppress leakage conduction, ensure ferroelectric performance, easy-to-handle effects

Inactive Publication Date: 2019-01-11
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, as the temperature increases (>90°C), pure BZT ceramics show a strong leakage conduction effect due to material defects, which manifests as a sharp increase in remnant polarization and coercive electric field on the hysteresis loop.
This is a fatal effect on the ferroelectricity of BZT

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] A kind of barium zirconate titanate ceramics, its chemical composition is Ba 1-x La 2x / 3 (Zr 0.2 Ti 0.8 )O 3 , the sintering temperature is 1400°C, and the doping content is 0.25%. Therefore, its chemical composition is Ba 0.9975 La 0.0017 (Zr 0.2 Ti 0.8 )O 3 , denoted as #2 ceramic sample.

[0042] Its preparation method is as follows:

[0043] 1) Weighing: according to chemical formula Ba 0.9975 La 0.0017 (Zr 0.2 Ti 0.8 )O 3 The proportion of each element in the raw material BaCO 3 , La 2 o 3 、TiO 2and ZrO 2 ;

[0044] 2) Ball milling: mix the raw materials and put them into a ball milling tank, add the ball milling solvent isopropanol and zirconia balls, fully ball mill at a speed of 250 rpm, then dry at 80°C, grind, and pass through a 60-mesh sieve;

[0045] 3) Pre-burning: Pre-burning the ground and sieved powder in step 2) at 1250° C., keeping it warm for 4 hours, and cooling to room temperature naturally;

[0046] 4) Secondary ball milling: ...

Embodiment 2

[0053] A kind of barium zirconate titanate ceramics, its chemical composition is Ba 1-x La 2x / 3 (Zr 0.2 Ti 0.8 )O 3 , the sintering temperature is 1400°C, and the doping content is 0.5%. Therefore, its chemical composition is Ba 0.995 La 0.0033 (Zr 0.2 Ti 0.8 )O 3 , recorded as #3 ceramic sample.

[0054] Its preparation method is as follows:

[0055] 1) Weighing: according to chemical formula Ba 0.995 La 0.0033 (Zr 0.2 Ti 0.8 )O 3 The proportion of each element in the raw material BaCO 3 , La 2 o 3 、TiO 2 and ZrO 2 ;

[0056] 2) Ball milling: mix the raw materials and put them into a ball milling tank, add the ball milling solvent isopropanol and zirconia balls, fully ball mill at a speed of 250 rpm, then dry at 80°C, grind, and pass through a 60-mesh sieve;

[0057] 3) Pre-burning: Pre-burning the ground and sieved powder in step 2) at 1250° C., keeping it warm for 4 hours, and cooling to room temperature naturally;

[0058] 4) Secondary ball milling: G...

Embodiment 3

[0065] A kind of barium zirconate titanate ceramics, its chemical composition is Ba 1-x La 2x / 3 (Zr 0.2 Ti 0.8 )O 3 , the sintering temperature is 1400°C, and the doping content is 1%. Therefore, its chemical composition is Ba 0.99 La 0.0067 (Zr 0.2 Ti 0.8 )O 3 , denoted as #4 ceramic sample.

[0066] Its preparation method is as follows:

[0067] 1) Weighing: according to chemical formula Ba 0.99 La 0.0067 (Zr 0.2 Ti 0.8 )O 3 The proportion of each element in the raw material BaCO 3 , La 2 o 3 、TiO 2 and ZrO 2 ;

[0068] 2) Ball milling: mix the raw materials and put them into a ball milling tank, add the ball milling solvent isopropanol and zirconia balls, fully ball mill at a speed of 250 rpm, then dry at 80°C, grind, and pass through a 60-mesh sieve;

[0069] 3) Pre-burning: Pre-burning the ground and sieved powder in step 2) at 1250° C., keeping it warm for 4 hours, and cooling to room temperature naturally;

[0070] 4) Secondary ball milling: Grind ...

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Abstract

The invention discloses a method for restraining leakage conductance of barium zirconate titanate ceramic and belongs to the technical field of ferroelectric ceramic preparation. The leakage conductance in non-doped barium zirconate titanate ceramic can be effectively restrained in the manner of adopting La element for A-site doping and sintering under oxygen atmosphere. Widening in a high field hysteresis loop is effectively restrained, so that the ferroelectric properties of the material under high temperature and high field can be guaranteed. The method has simple processing steps, is easyfor operation and has high repeatability. The method can be applied to the inorganic electrostriction ceramics and has a significant economic value.

Description

technical field [0001] The invention belongs to the technical field of preparation of ferroelectric ceramic materials, and in particular relates to a method for suppressing leakage conduction of barium zirconate titanate ceramics. Background technique [0002] In conventional electric field driven drivers, piezoelectric ceramics are used as the main material to realize mutual conversion between electric field and displacement (or strain). However, due to the influence of domain wall inversion, the large-signal strain generated by piezoelectric ceramics often has a strong hysteresis, that is, the inconsistency of the strain path generated when the voltage is applied and removed. In addition, piezoelectric ceramics need to be polarized under DC high voltage, and there are problems such as aging. Therefore, electrostrictive ceramics have more beneficial performance in high-precision drives. Electrostrictive ceramics produce no hysteretic response through the second-order elec...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/49C04B35/622
CPCC04B35/49C04B35/622C04B2235/3215C04B2235/3227C04B2235/6583
Inventor 靳立侯磊徐卓魏晓勇
Owner XI AN JIAOTONG UNIV
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