低烧陶瓷(A0.5xBi1-0.5x)(MoxV1-x)O4（A=Li、Na、K）湿化学法合成机理及其微波介电性能研究

项目名称： 低烧陶瓷(A0.5xBi1-0.5x)(MoxV1-x)O4（A=Li、Na、K）湿化学法合成机理及其微波介电性能研究

项目编号： No.51202182

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： 周迪

作者单位： 西安交通大学

项目金额： 25万元

中文摘要： 本项目旨在以硝酸铋、硝酸锂、硝酸钠、硝酸钾、钒酸氨及钼酸铵为原材料，采用共沉淀和水热反应法，通过调节酸碱性溶液、阳离子阴离子配比、pH值、表面活性剂、水热反应温度及时间、热处理温度等实验参数，制备高纯相、粒径小且分布均匀的白钨矿(A0.5xBi1-0.5x)(MoxV1-x)O4（A=Li+、Na+或K+）体系粉末样品；在较低烧结温度下（<800℃）得到一系列高性能（εr>75、Q×gt;12,000 GHz）的致密陶瓷样品。通过调节湿化学法工艺参数，研究白钨矿成相机理，颗粒生长规律及微观形貌影响因素；通过调节烧结工艺，研究粉体特性、晶粒尺寸与微波介电性能的关系；通过原位XRD及Raman方法研究白钨矿单斜到四方结构铁弹相变机理；通过红外谱拟合法研究本征微波介电性能，为进一步理解微波材料结构与性能的关系、开发新型低温烧结高介电常数、高品质因数的温度稳定型微波介质材料提供指导。

中文关键词： 微波介质；低温共烧陶瓷技术；低温烧结；；

英文摘要： The present proposal is focused on the synthesis of ultra-fine powders with small particle size, narrow size distribution and different particle shapes, which can be modified by adjusting the acid and alkaline solutions, ratio of cation to anion , pH values, surface active agents, solution temperatures, hydrothermal temperatures and incubation time, heating temperatures etc., of scheelite (A0.5xBi1-0.5x)(MoxV1-x)O4 (A=Li+, Na+, K+) systems via the co-precipitation method, hydrothermal method and other wet-chemical methods using the Bi(NO3)3o5H2O, LiNO3, NaNO3, KNO3, NH4VO3 and (NH4)6Mo7O24o4H2O as starting materials. A series of low temperature firing (<800 ℃) ceramics with high microwave dielectric performance (εr>75, Q×gt;12,000 GHz) are expected to be obtained by careful sintering processes with appropriate heat rate, sintering temperature, incubation time and cooling rate. The relation between processing parameters, powder characteristic, phase evolution and dielectric properties of ceramics will be studied. In situ XRD and Raman analysis will be employed to investigate the phase transition mechanism from monoclinic scheelite structure to tetragonal scheelite structure. The intrinsic microwave dielectric properties will be extrapolated from the fitting values from far-infrared spectra and used to help underst

英文关键词： Microwave dielectric；LTCC；Low temperature firing；；

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