W/Cr共掺杂对CaBi2Nb2O9陶瓷晶体结构及电学性能的影响
Effects of W/Cr Co-doping on the Crystal Structure and Electric Properties of CaBi2Nb2O9 Piezoceramics
黄建锋 1梁瑞虹 2周志勇2
作者信息
- 1. 中国科学院 上海硅酸盐研究所,上海 200050;中国科学院大学 材料科学与光电工程中心,北京 100049
- 2. 中国科学院 上海硅酸盐研究所,上海 200050
- 折叠
摘要
铌酸铋钙(CaBi2Nb2O9,CBN)是一种典型的铋层状结构压电材料,具有高居里温度(约 943℃)、高稳定性等特点,是 600℃以上高温压电振动传感器的重要候选功能元件,但其压电系数和高温电阻率较低,严重制约了CBN在高温压电振动传感器领域的实际应用.为了提高CBN压电陶瓷的高温稳定性,采用固相法制备了W/Cr共掺杂的CaBi2Nb1.975W0.025O9-x%Cr2O3(CBNW-x Cr,0<x≤0.2)单相铋层状结构压电陶瓷,研究了W/Cr元素共掺杂对晶体结构和电学性能的影响.结果表明:W/Cr元素共掺杂使压电陶瓷晶体结构由正交晶系向四方晶系转变,晶体结构畸变程度增强,并且压电性能和绝缘性能显著提高.当x=0.1 时,CBNW-0.1Cr压电陶瓷的居里温度为 931℃,压电系数为 15.6 pC/N,600℃时电阻率达到 106 Ω·cm量级,介电损耗仅为 0.029,该体系在高温压电领域有重要的潜在应用前景.
Abstract
Calcium bismuth niobate(CaBi2Nb2O9)is a typical bismuth layered structure piezoelectric material with high Curie temperature(about 943℃)and high stability,which is an important candidate functional element for high temperature vibration sensors above 600℃.However,its low piezoelectric coefficient and high temperature resistivity seriously limit the signal acquisition of high-temperature piezoelectric vibration sensor.To improve the comprehensive performance,in this work,W/Cr co-doped CaBi2Nb1.975W0.025O9-x%Cr2O3(CBNW-x Cr,0<x≤0.2)Aurivillius phase ceramics were prepared via conventional solid-state sintering route.The effects of W/Cr co-doping on the crystal structure and electrical properties of CBN piezoelectric ceramics were investigated.The results show that co-doping of W/Cr elements transforms crystal structure of the ceramics from orthorhombic to tetragonal crystal system,enhances distortion of the crystal structure,and significantly improves piezoelectric and insulating properties of the piezoelectric ceramics.When x=0.1,the Curie temperature is 931℃,the piezoelectric coefficient is 15.6 pC/N,the resistivity reaches the order of 106 Ω·cm at 600℃,and the dielectric loss is only 0.029,which endows the system an important potential application in the field of high-temperature piezoelectricity.
关键词
高温压电陶瓷/晶体结构/压电性能/赝四方畸变Key words
high-temperature piezoelectric ceramic/crystal structure/piezoelectric property/pseudo-tetragonal distortion引用本文复制引用
基金项目
国家自然科学基金重点项目(51932010)
出版年
2024
国家科技期刊平台
NSTL
万方数据