Synthesis and characterization of (Zn, Mn)TiO 3 by modified sol–gel route

Abstract

Hexagonal ilmenite-type (Zn 1− x Mn x )TiO 3 (0 ≤ x ≤ 0.9) ceramic powders were synthesized by a sol–gel route including the Pechini process with heat treatments at 600 °C for 3 h and 800 °C for 6 h. The thermal stability of ZnTiO 3 dielectric ceramics was improved (>1200 °C) by doping manganese. The dielectric constant of (Zn 1− x Mn x )TiO 3 ceramic was higher than those of (Zn, M)TiO 3 (M = Co, Ni, etc.), increased with the amount of manganese in the range of 0 ≤ x < 0.7 then decreased after the maximum point at x = 0.7 in the same frequency. Both the dielectric loss tangent and the dielectric constant decreased with increasing the measured frequencies. The value of dielectric loss tangent was relatively high because of magnetoresistive effect of manganese.