Synthesis and dielectric properties of a new class of MX6Ti6O19 (M=Ba, Sr and Ca; X=Mg and Zn) ceramics

MX6Ti6O19 (M = Ba, Sr and Ca; X = Mg and Zn) ceramics have been synthesized by the conventional solid state ceramic route. The dielectric properties such as dielectric constant (epsilon(r)), loss tangent (tandelta) and temperature coefficient of dielectric constant (T-epsilonr) of the sintered ceramic compacts are studied using an impedance analyzer up to the 13-MHz region. The zinc compositions have relatively high dielectric constant and low loss tangent compared to the Mg analogue. Out of the samples studied, BaZn6Ti6O19 ceramics show excellent dielectric properties. The structure and microstructure of these ceramic samples are also studied using powder X-ray diffraction, FTIR and SEM methods, and the results are presented. (C) 2002 Elsevier Science B.V. All rights reserved.