FAN Yuenong ¹, WANG Zhen ², TAO Lei ¹, BIAN Jianjiang ²

(1.School of Mechanical and Electronic Engineering, Jingdezhen Ceramic Institute, Jingdezhen 333403, Jiangxi, China;

2. Department of Inorganic Materials, Shanghai University, Shanghai 200444, China)

Abstract: (1-x)La_0.5Na_0.5WO_4-xLa_0.5Na_0.5TiO₃ composite ceramiccould be successfully densified after sintering at 900-1050 ℃. The dielectric permittivity increased obviously, Q × f value decreased, and the τf value changed from negative into positive with increasing La_0.5Na_0.5TiO₃ phase content. The x=0.2 composition sintered at 950 ℃ exhibited the following microwave dielectric properties:τ_f ~ -3.5 ppm/℃, Q×f ~about 10000 GHz, ε_r -about 15. The chemical compatibility of the x=0.2 composition with copper and silver powders was also investigated,and it revealed that no chemical reaction was taken place.

Key words: LTCC; ceramic composites; Microwave dielectric properties