Microwave Dielectric Properties for Ba(Mg_1/3Ta_2/3)O₃–A(Mg_1/2W_1/2)O₃ (A=Ba, Sr, and Ca) Ceramics

Abstract

For a high- Q dielectric resonator at microwave frequencies, complex perovskite-structured Ba(Mg 1/3 Ta 2/3 )O 3 –A(Mg 1/2 W 1/2 )O 3 (A=Ba, Sr, and Ca) ceramics have been developed. A(Mg 1/2 W 1/2 )O 3 effects on the crystal structure, microstructure, and microwave characteristic of Ba(Mg 1/3 Ta 2/3 )O 3 (BMT) were investigated. Ba(Mg 1/2 W 1/2 )O 3 (BMW) decreased the temperature coefficient of resonant frequency ( TCF ) for BMT. Sr(Mg 1/2 W 1/2 )O 3 (SMW) and Ca(Mg 1/2 W 1/2 )O 3 (CMW) increased it. Zero TCF was obtained for the BMT/BMW=95/5 composition. With 0.5 mol% BMW content, dielectric loss quality, Q d , reached a maximum (40000 at 10 GHz).