Mo基新型LTCC微波介质陶瓷的结构/性能调控基础研究

项目名称： Mo基新型LTCC微波介质陶瓷的结构/性能调控基础研究

项目编号： No.51202178

项目类型： 青年科学基金项目

立项/批准年度： 2013

项目学科： 无机非金属材料学科

项目作者： 庞利霞

作者单位： 西安工业大学

项目金额： 25万元

中文摘要： 本项目以Li2O-Bi2O3-MoO3三元体系中几种富含MoO3的本征低烧陶瓷体系为研究对象，围绕Mo基新型LTCC微波介质陶瓷结构/性能调控相关的若干基础科学问题展开系统的实验研究和理论探讨。通过研究晶体中化学键的性质以及密堆积系数与烧结温度的关系，建立晶体结构-低温烧结机理研究理论体系；通过第一性原理计算、远红外-THz光谱分析、微波介电性能测试三种手段结合，研究材料的本征介电性能以及极化机理问题；研究非本征因素（微观结构）对微波介电性能的影响。项目预期可以解决极化机理问题、低温烧结机理问题、结构与性能关系等几个共性的、基础性的关键科学问题，为实现Mo基新型本征LTCC微波介质陶瓷的高性能化（烧结温度低于900℃，介电常数在10~50范围内可系列化，Qf>15000GHz，-30ppm/℃≤TCF≤+30ppm/℃，可与Al、Ag或Cu电极共烧匹配）提供理论指导，具有重要的科学价值。

中文关键词： 低温共烧陶瓷；钼基陶瓷；远红外谱；极化机理；结构-性能调控

英文摘要： Based on the MoO3-reached low-firing ceramics in Li2O-Bi2O3-MoO3 ternary system, systemic experimental research and theoretical investigation on several basic scientific problems on regulation of structure and property in the new-type Mo-based LTCC microwave dielectric ceramic systems has been proposed in the present project. Theoretical system of Crystalline structure and low-temperature firing mechanism will be built based on the study of relations between the firing temperature and the chemical bond properties and close-packed structure; The intrinsic dielectric properties and polarization mechanism will be studied by first-principles calculation, far-infrared-THz spectra investigation, and microwave dielectric properties studies; The influence of extrinsic factors on microwave dielectric properties will also be studied. The common and basic key scientific problems such as polarization mechanism, low-temperature firing mechanism, and structure-property relationship, will be solved, and the theoretical results will contribute to the development of new-type Mo-based LTCC microwave dielectric ceramics with high properties (a low firing temperature <900℃, a large range of dielectric permittivity 10~50, a high Qf value >15000GHz, a near-zero temperature coefficient of resonant frequency -30ppm/℃≤TCF≤+30 ppm/℃, and

英文关键词： Low-temperature co-fired ceramics；Mo-based ceramics；Far-inferred spectra；polarization mechanism；regulation of structure and property