Synthesis and dielectric properties of MXTi7O16 (M = Ba and Sr; X = Mg and Zn) hollandite ceramics

MXTi7O16 (M = Ba and Sr; X = Mg and Zn) ceramics have been synthesized by the conventional solid state ceramic route. The dielectric properties such as dielectric constant (er), loss tangent (tan δ) and temperature variation of dielectric constant (τer) of the sintered ceramic compacts are studied using an impedance analyser up to 13 MHz region. The strontium compounds have relatively high dielectric constant and low loss tangent compared to the barium analogue. The phase purity of these materials has been examined using X-ray diffraction studies and microstructure using SEM method.