Low‐Fired (Zn,Mg)TiO3 Microwave Dielectrics

Abstract

A dielectric ceramic comprised of (Zn 1‐ x Mg x )TiO 3 ( x = 0 to x = 0.5) with low sintering temperature and promising microwave properties was prepared by applying a semichemical synthesis route and a microbeads milling technique. X‐ray diffractometry and thermal analyses results indicated that the phase stability region of the hexagonal (Zn,Mg)TiO 3 extended to higher temperatures as the amount of magnesium increased. The dielectric properties in this system exhibited a significant dependence on the sintering conditions, especially near the phase decomposition temperature. From 950°C, the temperature compensation characteristics occurred as the phase composition changed from hexagonal (Zn,Mg)TiO 3 to two phases: (Zn,Mg) 2 TiO 4 and rutile. The magnesium content for zero temperature coefficient (tau f ) was ~3 mol% at 950°C; however, tau f increased with the sintering temperatures because of the shift of the decomposition temperature.