钛酸钡基高温负温度系数热敏电阻材料的高电阻率低热敏常数特性及机理研究

项目名称： 钛酸钡基高温负温度系数热敏电阻材料的高电阻率低热敏常数特性及机理研究

项目编号： No.51462005

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： 李旭琼

作者单位： 桂林电子科技大学

项目金额： 47万元

中文摘要： 在实现高温宽温区（0～1000℃）的温度测控时，现有的温度传感器件难以兼顾高精度、快响应和低成本的要求。前期研究发现，经特种掺杂和特定工艺制备的钛酸钡基陶瓷呈现负电阻温度系数（NTC）效应，并且具有优异的高阻低热敏常数特性，其良好的高温稳定性和宽温区测温能力可以很好地满足上述热敏器件的要求，极具推广价值。但是这种材料的高阻低热敏常数特性作用机理尚不清楚，解释NTC效应的理论还需完善，性能参数的调节范围相对较窄，材料离实际应用仍有一定距离。为此，项目拟开展以下研究：引入铁电理论并结合变价离子间电子跃迁模型和能级理论，揭示材料NTC效应的作用机理；通过调控掺杂离子的种类和浓度、离子掺杂方式以及工艺参数，拓宽材料的性能参数调节范围，并揭示其高阻低热敏常数特性作用机理。这些工作的开展将为研究高阻低热敏常数高温NTC热敏材料及其应用奠定基础。本项目结合地方资源优势，有利于广西经济可持续健康发展。

中文关键词： 钛酸钡；负电阻温度系数；高电阻率低热敏常数；作用机理

英文摘要： Existing temperature sensors can not meet requirements of high precision，fast response and low cost, applied to temperature measurement and control in a wide temperature range and high temperature.BaTiO3-based ceramics specially doped with some cations show NTC effects with excellent properties of high resistivity and low thermal constant under certain conditions, which have been found by our group. They can meet requirements of temperature sensors, which show high-temperature stability and temperature measurement capability in a wide temperature range. And they have great value of popularization.However, three questions exist in them. The first is that high resistivity low thermal constant characteristics mechanism in materials are unobvious, and the second is that NTC effect mechanism need to be completed.The final is that the value of resistivity and thermal constant cannot be adjusted in wide range. There is a long way to go for practical application of materials.In order to solve the problems, some research work will be completed. NTC effect is explained by combining ferroelctric theory with hopping model and band conduction. high resistivity low thermal constant characteristics mechanism is studied by analysing types of charge carriers and ferroelectric, carrier mobility, microstructure, the Curie temperature, etc.. Performance parameter can be adjusted in wide range by altering different dopants,doping amount, ion doping method, process parameters, etc.. And high resistivity low thermal constant characteristics mechanism is studied. This work is the foundations of research on high temperature NTC materials with high resisitivity and low thermal constant.This project is closely connected with mineral resources advantages in Guangxi and helps the sustainable and healthy development of mineral resources economy in Guangxi.

英文关键词： Barium titanate;Negative Temperature Coefficient of Resistivity;High Resistivity and Low Thermal Constant;Mechanism