Eureka AIR delivers breakthrough ideas for toughest innovation challenges, trusted by R&D personnel around the world.

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
View PDF8 Cites 1 Cited by
  • 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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Method for restraining leakage conductance of barium zirconate titanate ceramic
  • Method for restraining leakage conductance of barium zirconate titanate ceramic

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 ...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
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
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com