Abstract
In this paper, for the purpose of enhancement in the magnetic behavior, the five-layer Aurivillius phase structure Bi6Fe2-xCoxTi3O18 (BFCT-x, x = 0.0 ~ 2.0) ceramics were synthesized using the solid-state reaction method from a mixture of Bi2O3, Co2O3, Fe2O3, and TiO2 powders with different stoichiometric ratio. The microstructure, ferromagnetic and ferroelectric properties are investigated. The crystallographic structures of BFCT-x are determined to be the typical five-layer Aurivillius phase with a suggested structural transformation at heavy doping of Co ions. At room temperature, the remnant magnetization (2Mr) of BFCT-0.0, BFCT-0.6, BFCT-1.0 and BFCT-2.0 samples are 0.043 memu/g, 0.59 emu/g, 0.81 emu/g and 1.75 memu/g, respectively. The 2Mr, at first, gradually enhance and reach a greatest value of 0.81 emu/g at x = 1.0 then degrade again with the increasing of the ratio x. At room temperature, the samples have ferroelectricity, which the remnant polarization (2Pr) of the BFCT-0.0 , BFCT-0.6, BFCT-1.0 and BFCT-2.0 samples are 2.8 μC/cm2, 8.0 μC/cm2, 3.0 μC/cm2 and 7.2 μC/cm2 respectively. The 2Pr first increases, then decreases and increases again with Co doping. When x = 0.6, the 2Pr reaches a maximum value of 8.0 μC/cm2.
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