Ba(Zn_1/3Nb_2/3)O₃–Sr(Zn_1/3Nb_2/3)O₃ Solid Solution Ceramics with Temperature-Stable High Dielectric Constant and Low Microwave Loss

Abstract

Solid solution ceramics in the Ba(Zn 1/3 Nb 2/3 )O 3 (BZN)–Sr(Zn 1/3 Nb 2/3 )O 3 (SZN) system have been studied with a view to finding materials for use as dielectric resonators at microwave frequency. The relative dielectric constant and the unloaded Q at 10 GHz are respectively 41 and 5400 for BZN, and 40 and 2000 for SZN. The temperature coefficient of the resonant frequency is estimated as 30 ppm/°C for BZN and -38 ppm/°C for SZN. The dielectric constant of 0.3 BZN–0.7 SZN ceramic is nearly independent of temperature, which gives a very small estimated temperature coefficient of the resonant frequency of -5 ppm/°C.