Abstract
Single phase Bi0.9La0.1FeO3 (BLFO) and Bi0.9La0.1Fe0.98Nb0.02O3 (BLFNO) polycrystalline ceramics were prepared by conventional solid state reaction followed immediately by the quenching process. An obvious structure transition from the rhombohedral-type to the monoclinic-type with the doping of Nb was observed. The average grain size decreased from 7 µm for BLFO to 500 nm for BLFNO. The magnetic ordering temperature of BLFNO decreased in comparison with the sample free of Nb. BLFNO shows a large coercive field, 1.35 T, and a large remanent magnetization, 0.23 A m2 kg−1, at 300 K. The possible reasons for the remarkable magnetic performance of BLFNO are discussed.
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