低钪BSPT高温压电陶瓷的气氛烧结及其高温电导机理研究

项目名称： 低钪BSPT高温压电陶瓷的气氛烧结及其高温电导机理研究

项目编号： No.51462030

项目类型： 地区科学基金项目

立项/批准年度： 2015

项目学科： 一般工业技术

项目作者： 石维

作者单位： 铜仁学院

项目金额： 47万元

中文摘要： BiScO3-PbTiO3（BSPT）压电陶瓷具有居里温度高、压电性能好，可望应用于高温压电传感器，是当前国际新型压电铁电研究热点之一。但Sc2O3成本高、BSPT陶瓷高温电导率大，制约了该材料体系的应用。本项目瞄准低钪BSPT基压电陶瓷，针对高温电导机理 、气氛烧结机制及其对氧空位、缺陷抑制机理两个关键科学问题开展研究；采用固相反应气氛烧结法制备低钪BSPT基压电材料；采用XRD、XPS、高温电导测试仪等表征材料组分、结构、电学性能；掌握低钪BSPT基压电陶瓷高温电导机理；掌握气氛烧结低钪BSPT基陶瓷的致密化过程及其对氧空位、缺陷的抑制机理；利用低钪BSPT基高温压电陶瓷试制高温振动传感原型器件。发表SCI、EI收录论文8篇以上；申请或获授权国家发明专利1~2项；为西部高校培养青年教师2~3人。本项目重要、紧迫，对研究新型高温压电材料、发展高温压电传感器具重要意义。

中文关键词： 压电陶瓷；准同型相界；介电性能；电导率；高居里温度

英文摘要： BiScO3 - PbTiO3 (BSPT) piezoelectric ceramics with high Curie temperature and high piezoelectric performance could be applied for high temperature piezoelectric sensors and, therefore, becomes a research hotspot in current novel piezoelectric and ferroelectric researches. However, the high cost of Sc2O3 and the large conductivity at high temperatures for BSPT ceramics have restricted the application of this material system. This project aims at BSPT-based piezoelectric ceramics with low scandium content and focuses on two key scientific problems, namely, high temperature conductance mechanism and atmosphere sintering mechanism as well as its inhibition of oxygen vacancies and defects. Accordingly, low-scandium-content BSPT based piezoelectric materials will be prepared by the solid state reaction method with atmosphere sintering; then, the material composition, structure, and electrical properties will be characterized respectively by XPS, XRD, and high temperature conductivity testing instruments; thus, the high temperature conductivity mechanism, the densification process and the inhibition mechanism of oxygen vacancies and defects during the atmosphere sintering will be grasped for low-scandium-content BSPT based piezoelectric ceramics; eventually, high temperature vibration sensor prototype devices will be tentatively fabricated using the low-scandium-content BSPT based high temperature piezoelectric ceramics. More than 8 SCI/EI-indexed papers will be published; 1~2 national invention patents will be applied or granted; 2~3 young teachers will be cultivated for western universities. We are confident that this project is important and urgent because it is significant for the study of novel high temperature piezoelectric materials and development of high temperature piezoelectric sensors.

英文关键词： Piezoceramics;MPB;Dielectric property;Condutivity;High Tc