钙钛矿微波陶瓷显微组构和电学微结构与其高介电高损耗来源构效关系研究

项目名称： 钙钛矿微波陶瓷显微组构和电学微结构与其高介电高损耗来源构效关系研究

项目编号： No.11464006

项目类型： 地区科学基金项目

立项/批准年度： 2015

项目学科： 数理科学和化学

项目作者： 袁昌来

作者单位： 桂林电子科技大学

项目金额： 58万元

中文摘要： 近年来，高介电微波陶瓷的性能提高和发展基本处于停滞状态，一个关键的原因是其高介电高损耗的起源机理没有得到合理有效的解释。为解决这个问题，本项目以高介电钙钛矿SrTiO3体系微波陶瓷为研究主体，借助光电子能光谱仪、拉曼光谱和透射电镜等表征其显微组成结构；同时采用交流阻抗谱、导电型原子力显微镜和综合物理性能测试系统等分析陶瓷电学微结构；研究尺寸效应和烧结气氛对微波陶瓷显微组构和电学微结构的影响规律。把这些分析所得显微组构和电学微结构进行有机结合，综合阐述SrTiO3系微波陶瓷的构效关系和高介电高损耗起源机制。为将来研究与开发介电常数更高，兼具低损耗、高稳定的高性能微波陶瓷奠定理论与实验基础。

中文关键词： 钙钛矿微波陶瓷；电学微结构；SrTiO3；介电性能；构效关系

英文摘要： Recently, the performance improvement and development of high-dielectric microwave ceramics are basically in the halting state, the key reason is that origination mechanism of high-dielectrics and large dielectric losses in microwave ceramics were not effectively elucidated. In order to resolve the probles, high-dielectric SrTiO3 ceramic system with perovskite structure is regarded as the objective studies in the project. The microcompositions and microstructures of the system were characterized by X-ray Photoelectron Spectroscopy, Raman Spectrum and Transmission Electron Microscope, et al. The electrical microstructures of the microwave ceramics were analyzed by AC Complex Impedance Spectroscopy, Conductive Atomic Force Microscope and Physical Property Measurement System, et al. Effect of size effect and sintering atmosphere on microcompositions, microstructures and electrical microstructures were also investigated in the microwave ceramics. Structure-properties raltion, origination mechanism of high-dielectrics and large dielectric losses of SrTiO3 ceramic system are systematically elucidated by the conjunction of microcompositions-microstructures and electrical microstructures obtained from the analysis. These will make a theoretical and experimental foundation on the studies and development of high-performance microwave ceramics with higher dielectric constants, low losses and high stability in the future.

英文关键词： Perovskite-type microwave ceramics;Electrical microstructures;SrTiO3;Dielectric properties;Structure-properties relation