无机材料学报

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W/Cr共掺杂对CaBi2Nb2O9陶瓷晶体结构及电学性能的影响

黄建锋1,2, 梁瑞虹1, 周志勇1   

  1. 1.中国科学院 上海硅酸盐研究所,上海200050;
    2.中国科学院大学 材料科学与光电工程中心, 北京 100049
  • 收稿日期:2024-02-05 修回日期:2024-02-28 出版日期:2024-03-30 网络出版日期:2024-03-30
  • 作者简介:黄建锋(1999-), 男, 硕士研究生. E-mail: huangjianfeng21@mails.ucas.ac.cn.
  • 基金资助:
    国家自然科学基金重点项目(51932010)

Effect of W/Cr Co-doping on the Crystal Structure and Electric Properties of CaBi2Nb2O9 Piezoceramics

HUANG Jianfeng1,2, LIANG Ruihong1, ZHOU Zhiyong1   

  1. 1. Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China;
    2. Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing 100049, China
  • Received:2024-02-05 Revised:2024-02-28 Published:2024-03-30 Online:2024-03-30
  • About author:HUANG Jianfeng (1999-), male, Master candidate. E-mail: huangjianfeng21@mails.ucas.ac.cn
  • Supported by:
    National Natural Science Foundation of China (51932010)

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(Tc为943 ℃)、高稳定性等特点,是600 ℃以上高温振动传感器的重要候选功能元件,但其较低的压电系数和高温电阻率,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-xwt%Cr2O3(CBNW-xCr, 0<x≤0.2)单相铋层状结构高温压电陶瓷,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元素共掺杂使陶瓷晶体结构由正交晶系向四方晶系转变、晶体结构畸变增强,并且显著提高了压电陶瓷的压电性能和绝缘性能。当x=0.1时,居里温度为931 ℃,压电系数(d33)由6 pC/N提高到15.6 pC/N,600 ℃时电阻率达到了106 Ω∙cm量级,介电损耗(tanδ)仅为0.029,该体系在高温压电领域有重要的潜在应用前景。

关键词: 高温压电陶瓷, 晶体结构, 压电性能, 赝四方畸变

Abstract: Calcium bismuth niobate (CaBi2Nb2O9) is a typical bismuth layered structure piezoelectric material with high Curie temperature (TC 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 sensors, and in order to improve the comprehensive performance, in the work, W/Cr co-doped CaBi2Nb1.975W0.025O9-xwt%Cr2O3 (CBNW-xCr,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 the co-doping of W/Cr elements transforms the crystal structure of ceramics from orthorhombic to tetragonal crystal system, enhances the distortion of the crystal structure, and significantly improves the piezoelectric and insulating properties of piezoelectric ceramics. When x=0.1, the Curie temperature is 931 ℃, the piezoelectric coefficient (d33) is increased from 6 pC/N to 15.6 pC/N, the resistivity reaches the order of 106 Ω∙cm at 600 ℃, and the dielectric loss (tanδ) is only 0.029, which makes the system an important potential application in the field of high-temperature piezoelectricity.

Key words: high-temperature piezoelectric ceramics, crystal structure, piezoelectric properties, pseudo-tetragonal distortion

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