Magnetic properties of Co doped MgTiO3 ceramics

Structural, magnetic and dielectric properties of (Mg1-xCOx)TiO3 (x=0-0.07) ceramics prepared by the semi-alkoxide precursor method are investigated. All the sintered samples exhibit paramagnetic nature at room temperature, but magnetic susceptibility increases with increasing Co content up to 0.03 and decreases at higher Co content. Temperature dependent magnetization data obtained under zero-field-cooled (ZFC) and field-cooled (FC) conditions reveal a ferromagnetic to paramagnetic phase transition around 228 K for x=0.03 and bifurcation between the ZFC and PC data shifts to lower temperature from 170 to 150 K with increasing the applied field from 100 to 500 Oe. The broadband dielectric properties are studied in the temperature range 133-300 K and in the frequency range of 1 MHz to 1 GHz. It is observed that both epsilon' and epsilon '' of (Mg0.97Co0.03)TiO3 ceramic increase with increasing temperature. Interestingly, the temperature dependent dielectric properties of (Mg0.97Co0.03)TiO3 ceramic measured at 1 GHz exhibit anomalies at temperatures where the magnetic phase transitions were observed. (C) 2014 Elsevier B.V. All rights reserved