无机材料学报2023，Vol.38Issue(12)：1420-1426,7.DOI:10.15541/jim20230167
层状结构第二相增强BiFeO3-BaTiO3陶瓷电阻率研究
Enhanced Resistivity Induced by the Second Phase with Layered Structure in BiFeO3-BaTiO3 Ceramics
摘要
Abstract
BiFeO3-BaTiO3(BF-BT)ceramics possess both high Curie temperature and excellent piezoelectric properties,and have a quite wide application prospects in high-temperature piezoelectric sensors and actuators.However,the resistivity of BF-BT ceramics is too low at high-temperature,which can lead to deterioration or even failure of the device's high-temperature performance.Therefore,improving the resistance performance of BF-BT ceramics is the key issue that must be addressed before its application.However,as a type of ferrite,it is difficult to improve resistivity through conventional methods,such as doping modification and optimizing sintering system.In this work,an abnormal increase in resistivity was discovered in BF-BT ceramics,which was confirmed to be related to the second phase Bi25FeO40.Microstructural analysis shows that the second phase has a special layered periodic structure,in which every three rows of atoms constitute a period,and most defects concentrate in one layer of atoms.The pure Bi25FeO40 was successfully synthesized using traditional solid phase method and introduced as an additive into the 0.70BF-0.30BT component,which can increase the resistivity at 300℃from 1.03 MΩ·cm to 4.33 MΩ·cm.In addition,the results of COMSOL simulation confirm that introducing this second phase can increase the resistivity of the 0.67BF-0.33BT component by one order of magnitude.According to the energy filtering effect,this special structure with high energy barriers can prevent carrier migration and improve the resistivity of BF-BT ceramics.This work provides a practical and feasible method for improving the resistivity of BF-BT ceramics.关键词
电阻率/载流子迁移/BiFeO3-BaTiO3陶瓷/仿真模拟Key words
resistivity/carrier migration/BiFeO3-BaTiO3 ceramics/simulation confirm分类
化学化工引用本文复制引用
康文烁,郭晓杰,邹凯,赵祥永,周志勇,梁瑞虹..层状结构第二相增强BiFeO3-BaTiO3陶瓷电阻率研究[J].无机材料学报,2023,38(12):1420-1426,7.基金项目
国家自然科学基金(51972321,U2241242) （51972321,U2241242）
国家重点研发计划(2022YFF0709702) （2022YFF0709702）
中国科学院先导计划(XDA2203003)National Natural Science Foundation of China(51972321,U2241242) （XDA2203003）
National Key Research and Development Program of China(2022YFF0709702) （2022YFF0709702）
Pilot Technology for Chinese Academy of Sciences(XDA2203003) （XDA2203003）
