无机材料学报2024，Vol.39Issue(8)：887-894,8.DOI:10.15541/jim20240065
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
摘要
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分类
化学化工引用本文复制引用
黄建锋,梁瑞虹,周志勇..W/Cr共掺杂对CaBi2Nb2O9陶瓷晶体结构及电学性能的影响[J].无机材料学报,2024,39(8):887-894,8.基金项目
国家自然科学基金重点项目(51932010)National Natural Science Foundation of China(51932010) （51932010）
