Synthesis and Characterization of Multifferoics 16%(Fe2O3)4%(BaCO3)80%(BaTiO3)

Abstract

The initial powder (16 % Fe2O3, 4 % BaCO3, 80 % BaTiO3) was mechanically activated in a planetary mill for 20, 80, 120, 160, 200 and 220 minutes in air. Modified Faraday method was used to perform magnetization measurements of compressed activated powder. The value of magnetization of these samples increases with increase in time of activation from 0.77 Am2kg-1 to 1.74 Am2kg-1. Thermomagnetic measurements in 20-600 °C temperature interval was used to investigate the dependence of magnetization on temperature. Multiple heating cycles of the sample activated for 120 min shows that after heating to 540 °C and 600 °C the value of magnetization increases 17 % and 62 %, respectively. Compressed powder samples were sintered for 2 hours at 1200 °C, leading to an increase in magnetization of 81 to 123 %. Thermomagnetic measurements of sintered samples in 20-450 °C temperature interval shows that sintered samples possess both ferromagnetic and ferroelectric properties. The relative dielectric constant of sintered samples at room temperature is around 8x104, depending on mechanical activation time.