Abstract
The effect of CuO and MnO2 as sintering additives on the structural, ferroelectric, and magnetic properties of 0.7BiFeO3−0.3(Ba0.85Ca0.15)TiO3 was investigated. The addition of CuO can inhibit grain growth, and the sample possesses the maximum remanent magnetization. However, the addition of MnO2 can promote grain growth, and the sample exhibits the maximum remanent polarization of 34μC/cm2. Nevertheless, the addition of both CuO and MnO2 can markedly enhance the magnetic properties. The magnetization measurements manifest that all the samples undergo a paramagnetic to ferrimagnetic transition arising from the existence of a net moment due to the antiferrimagnetic interactions between Fe2+ and Fe3+ sublattices. The enhanced magnetism of the samples with the addition of CuO and MnO2 can be due to the enhanced superexchange interaction between Fe2+ and Fe3+ arising from the increased Fe–O–Fe bond angle.
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