Structure and Dielectric Properties of (Sr0.2Ca0.488Nd0.208) TiO3-Li3NbO4 Ceramic Composites

[摘要] The new ceramic composites of (1-x) Li3NbO4-x(Sr0.2Ca0.488Nd0.208)TiO3were prepared by the conventional solid state reaction method. The sintering behavior, phase composition, microstructure and microwave dielectric properties of the ceramics were investigated specially. The SEM and XRD results show that (1-x) Li3NbO4-x (Sr0.2Ca0.488Nd0.208) TiO3(0.35≤x≤0.5) composites were composed of two phase, i.e. perovskite and Li3NbO4. With the increase of x, therincreases from 27.1 to 38.7, Q×f decreases from 55000 GHz to 16770 GHz, and the τfincreases from -49 ppm/°C to 226.7 ppm/°C. The optimized dielectric properties withr∼31.4, Q×f∼16770GHz and τf∼-8.1ppm/°C could be obtained as x=0.4 sintered at 1100°C for 4h. The as-prepared ceramic is expected to be used in resonators, filters, and other microwave devices.

[发布机构] School of Materials Science and Engineering, Guangxi Key Laboratory of Information Materials, Guilin University of Electronic Technology, Guilin; 541004, China^1

[效力级别] 机械制造 [学科分类] 材料科学（综合）

[关键词] Ceramic composites;Microwave dielectric properties;Sem and xrd;Sintering behaviors;Solid state reaction method;Two phase