铌酸铋钠基压电织构陶瓷的高温压电性能及导电机制研究

项目名称： 铌酸铋钠基压电织构陶瓷的高温压电性能及导电机制研究

项目编号： No.61201064

项目类型： 青年科学基金项目

立项/批准年度： 2013

项目学科： 电子学与信息系统

项目作者： 陈强

作者单位： 四川大学

项目金额： 25万元

中文摘要： 铋层状铁电体Na0.5Bi2.5Nb2O9(NBN)基压电陶瓷因其高居里温度Tc(>785℃)在高温压电传感器中有重要潜在应用。但其压电活性的提高、陶瓷结构、掺杂与性能的关联、陶瓷制备工艺的优化、高温下压电性能的表征、本征与非本征导电机制等关键问题需进一步解决。针对上述问题，本项目将重点解决以下三个关键科学问题：(1)、NBN基高温压电陶瓷的掺杂及组分设计原则；（2）、基于陶瓷轧膜工艺的模板晶粒生长新工艺与NBN基高温压电陶瓷性能的关联；（3）、NBN基高温压电陶瓷本征与非本征导电机制及其高温压电性能的表征方法。通过本项目的研究，可望获得性能优异的NBN基高温压电陶瓷组成，掌握具有高Tc、高d33，且晶粒取向度可控的NBN基高温压电织构陶瓷制备工艺；掌握NBN基高温压电陶瓷电导率及压电性的温度变化特性，这对于高温压电传感器的设计具有重要意义。因而本项目研究具有重要的科学意义和应用价值。

中文关键词： 高温压电陶瓷；铌酸铋钠；铋层状铁电体；高居里温度；

英文摘要： Bismuth layer-structured ferroelectrics bismuth sodium niobate (Na0.5Bi2.5Nb2O9,NBN)based piezoelectric ceramics are potentially used in high temperatue piezoelectric sensors because of their high Curie temperature Tc.However, there are some critical issues, such as the enhancement of piezoelectric property, the relationship between structure， doping and properties, the optimized processing of ceramics,characterization of piezoelectric property at high temperature, and the mechanisms of extrinsic and intrinsic conduction etc., needed to be solved further.This proposal will mainly focus on the following three vital scientific problems. Firstly, what is the principle of doping and compositional designing of NBN based piezoelectric ceramics. Secondly, what is the relationship between performances and a new templated grain growth process based upon rolling forming technique. Finally, what is the mechanisms of intrinsic and extrinsic conduction of NBN-based piezoelectric ceramics and how to characterize the piezoelectric property of NBN-based ceramics at high temperature. The aims of this proposal are as follows:The first is to achieve optimum compositions of NBN-based high temperature piezoelectric ceramic with excellent properties.The second is to master a new templated grain growth process based on rolling formin

英文关键词： high temperature piezoelectric ceramics；sodium bismuth niobate；bismuth layer-structured ferroelectrics；high Curie temperature；