无机材料学报2012，Vol.27Issue(7)：726-730,5.DOI:10.3724/SP.J.1077.2012.11531
含铋层状结构陶瓷CaBi2Nb2O9的A位掺杂改性研究
Study on A-site Cation Doping of CaBi2Nb2O9 with Bismuth Layered Structure
摘要
Abstract
High curie temperature piezoelectric ceramics based on KLa-doped Ca1-x(KLa)x/2BiNb2O9(x=0-0.20) were prepared by a conventional solid state reaction method. Crystal structure and microstructures of Ca1-x(KLa)x/2Bi2Nb2O9, ceramics were characterized by XRD and SEM. XRD patterns show that the crystal structures are a single phase of bismuth oxide layer structure having general formula (Bi2O2)2+(Am-1BmO3m+1)2- with m = 2. The grains of polished and thermally etched surfaces revealled a plate-liked morphology. The Curie point (Tc) decreases obviously whereas the piezoelectric activity of CBNO ceramics is significantly improved by the doping of potassium and lanthanum. The KLa-doped CBNO materials have an electrical conductivity value 1-2 orders of magnitude lower than undoped samples. The thermal depoling behavior of Ca1-x(KLa)x/2Bi2Nb2O9 ceramics shows that all of them have a high Curie point (Tc≥850℃) and show good resistance to thermal depoling up to temperatures close to their Curie points. The results showed that the excellent properties is obtained in the ceramics with composition of x=0.1, i.e. d33=15.8 pC/N, Tc=870℃ and the DC conductivity is one order of magnitude smaller than that of undoped CBNO. All the results suggest that the doped CaBi2Nb2O9 is a potential material for high temperature sensor.关键词
压电陶瓷/掺杂/压电系数/CaBi2Nb2O9Key words
piezoelectric ceramics/ modified/ d33/ CaBi2Nb2O9分类
数理科学引用本文复制引用
宗立超,曾江涛,赵苏串,阮伟,李国荣..含铋层状结构陶瓷CaBi2Nb2O9的A位掺杂改性研究[J].无机材料学报,2012,27(7):726-730,5.基金项目
国家自然科学基金(51011120098,50977088) （51011120098,50977088）
国家自然科学基金委员会与中国工程物理研究院联合基金(10876041) （10876041）
