Abstract
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 228K for x=0.03 and bifurcation between the ZFC and FC data shifts to lower temperature from 170 to 150K with increasing the applied field from 100 to 500Oe. The broadband dielectric properties are studied in the temperature range 133–300K and in the frequency range of 1MHz to 1GHz. It is observed that both ε′ and ε′′ of (Mg0.97Co0.03)TiO3 ceramic increase with increasing temperature. Interestingly, the temperature dependent dielectric properties of (Mg0.97Co0.03)TiO3 ceramic measured at 1GHz exhibit anomalies at temperatures where the magnetic phase transitions were observed.
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