项目名称: 多组元共掺杂TiO2陶瓷晶界偏析及晶界势垒结构研究
项目编号: No.51262017
项目类型: 地区科学基金项目
立项/批准年度: 2013
项目学科: 一般工业技术
项目作者: 甘国友
作者单位: 昆明理工大学
项目金额: 49万元
中文摘要: TiO2压敏陶瓷是一种具有典型晶界电学性质的多晶陶瓷材料,材料的电学性质与晶界结构和晶界的势垒结构密切相关。将实验研究和理论计算相结合,研究影响晶界偏析的主要因素,为晶界偏析控制和晶界势垒结构控制提供实验和理论依据。 第一,分别采用经验模型和第一性原理对TiO2 压敏陶瓷的晶界偏析和晶界势垒的一般性质进行理论预测。第二,采用实验方法研究共掺杂、工艺参数对晶界偏析和晶界势垒的影响。第三,通过实验工艺参数、结构检测和性能测试得到晶界偏析和晶界势垒结构的主要参数,对比实验数据与理论计算,改进理论计算方法完善理论计算。最后,根据修正完善的理论计算,用实验验证晶界偏析对晶界势垒结构的影响。 晶界偏析的有效控制和晶界势垒结构的合理设计将为基于晶界势垒的电子元器件及开发新型电子元器件提供理论支持。
中文关键词: TiO2;压敏陶瓷;非线性系数;压敏电压;
英文摘要: TiO2 varistor ceramics is a kind of polycrystalline ceramic materials with typical grain boundary electrical properties, and the electrical properties are closely related to the grain boundary structure and grain boundary barriers structure. Combining with experiments and theoretical calculations to study the main factors influencing grain boundary segregation, and then providing the experimental and theoretical basis to control the grain boundary segregation and grain boundary barriers structure. Firstly, grain boundary segregation and grain boundaries potential barriers of TiO2 varistor ceramics will be theoretically predicted by using the empirical model and the first principles respectively. Secondly, the impact of doping and process parameters on grain boundary segregation and grain boundaries potential barriers will be investigated by experiments. Thirdly, through the experimental process parameters, structure testing and performance testing,we can get the main parameters of grain boundary segregation and grain boundary barrier structure, and comparing with the experimental data and the theoretical calculation, to improve theory method and perfect theoretical calculation. Finally, according to the improved theoretical calculation and experiments to show the influence of grain boundary segregation on grain
英文关键词: TiO2;varistor;nonlinear coefficient;breakdown voltage;