Lead-free compound ferroelectric ceramic composed of potassium-bismuth titanate and zinc oxide and preparation thereof

A technology of ferroelectric ceramics and composite ceramics, applied in the field of ferroelectric ceramics, can solve problems such as limiting the application range and temperature stability of KBT-based systems, and achieve the effects of improving various properties and inhibiting phase transitions

Active Publication Date: 2017-03-22
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This transition, like the phase transition of NBT, is a point of contention and also limits the application range and temperature stability of KBT-based systems.

Method used

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  • Lead-free compound ferroelectric ceramic composed of potassium-bismuth titanate and zinc oxide and preparation thereof
  • Lead-free compound ferroelectric ceramic composed of potassium-bismuth titanate and zinc oxide and preparation thereof
  • Lead-free compound ferroelectric ceramic composed of potassium-bismuth titanate and zinc oxide and preparation thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Recipe: 0.8K 0.5 Bi 0.5 TiO 3 :0.2ZnO

[0024] K 0.5 Bi 0.5 TiO 3 Preparation of powders for analytically pure K 2 CO 3 (99.99%), Na 2 CO 3 (99.99%) and Bi 2 o 3 (99.99%) as raw material, according to K 0.5 Bi 0.5 TiO 3 Weigh the raw materials according to the elemental ratio, ball mill them in absolute ethanol for 12 hours, dry them, calcinate them at 800°C for 2 hours, ball mill them again for 12 hours, and dry them to obtain the pure perovskite phase structure K 0.5 Bi 0.5 TiO 3 Powder. To improve K 0.5 Bi 0.5 TiO 3 phase stability, the K obtained by calcination 0.5 Bi 0.5 TiO 3 The powder was pre-sintered at 980°C for 2 hours, ball milled for 12 hours, and dried for K 0.5 Bi 0.5 TiO 3 : Preparation of ZnO composite ceramics.

[0025] 0.8K 0.5 Bi 0.5 TiO 3 : Preparation of 0.2ZnO composite ceramic sample Weigh the K obtained by pre-sintering in molar ratio 0.5 Bi 0.5 TiO 3 Powder and ZnO nanopowder (particle size about 30nm), ball mill...

Embodiment 2

[0027] Recipe: 0.75K 0.5 Bi 0.5 TiO 3 :0.25ZnO

[0028] K 0.5 Bi 0.5 TiO 3 The powder calcining temperature is 840°C, hold for 4 hours, the pre-calcination temperature is 1010°C, hold for 3 hours, K 0.5 Bi 0.5 TiO 3 : The sintering temperature of ZnO multiphase ceramics is 1030°C, and the temperature is kept for 2h. Others are with embodiment 1.

Embodiment 3

[0030] Recipe: 0.75K 0.5 Bi 0.5 TiO 3 :0.25ZnO

[0031] K 0.5 Bi 0.5 TiO 3 The powder calcining temperature is 820°C, hold for 3 hours, the pre-calcination temperature is 1000°C, hold for 2.5h, K 0.5 Bi 0.5 TiO 3 : The sintering temperature of ZnO multiphase ceramics is 1020°C, and the temperature is kept for 2.5h. Others are with embodiment 1.

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PUM

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Abstract

The invention relates to a lead-free compound ferroelectric ceramic composed of potassium-bismuth titanate and zinc oxide and preparation thereof, and belongs to the technical field of ferroelectric ceramics. The invention aims at inhibiting the depolarization phenomenon of K0.5Bi0.5TiO3 and promoting the ferroelectric property. K2CO3, TiO2, Bi2O3 and ZnO are taken as raw materials and are compounded to prepare the lead-free compound ferroelectric ceramic K0.5Bi0.5TiO3:ZnO by a two-step solid phase method. Through X-ray diffraction, scanning electron microscope and a dielectric test, the microcosmic structure and dielectric behavior of the compound ceramic are analyzed. The results show that three-phase Zn2TiO4 is generated in the compound ceramic after ZnO is added into K0.5Bi0.5TiO3, the introduction of ZnO can inhibit the phase transformation of K0.5Bi0.5TiO3 from normal ferroelectrics to relaxation ferroelectrics, and the introduction of ZnO has significance in applying and researching K0.5Bi0.5TiO3.

Description

technical field [0001] The present invention relates to a novel K 0.5 Bi 0.5 TiO 3 : ZnO lead-free composite ferroelectric ceramics, made of perovskite type K 0.5 Bi 0.5 TiO 3 It is compounded with nano-semiconductor ZnO, avoids changing from normal ferroelectricity to relaxation ferroelectricity before the Curie point, has high temperature stability of ferroelectric performance, and belongs to the technical field of ferroelectric ceramics. [0002] technical background [0003] Piezoelectric ceramics are materials sensitive to electricity, force, heat, and light. They are products of artificial polarization of ferroelectric ceramics. They have been widely used in ultrasonic transducers, sensors, nondestructive testing, and communications. The current general-purpose ferroelectric ceramics are based on Pb(Zr,Ti)O 3 (PZT) ceramics, in which the lead content is generally more than 70%, are volatile at high temperatures and during use, and will cause damage to the environm...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/475C04B35/622C04B35/634
CPCC04B35/475C04B35/622C04B35/6342C04B2235/3201C04B2235/3284
Inventor 朱满康李玲位秋梅郑木鹏侯育冬汪浩严辉
Owner BEIJING UNIV OF TECH
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