Abstract
Bi0.9Eu0.1Fe0.95Co0.05O3 (BEFCO) and Bi0.9Eu0.05La0.05Fe0.95Co0.05O3 (BELFCO) nanoparticles have been prepared by sol–gel method. X-ray diffraction (XRD) pattern shows that the samples are pure and single-phase. The local structure has been measured with X-ray absorption fine structure (XAFS) of the Fe K-edge, which reveal the decrease of Fe2+ ions and the shift of FeO bond distance in codoped samples, compared with BiFeO3 (BFO) nanoparticle sample prepared under similar conditions. Magnetic hysteresis loops show a significant enhancement of magnetization with a remanent magnetization (Mr) of about 0.22emu/g for BEFCO and about 0.35emu/g for BELFCO. It is concluded that magnetic properties were greatly improved mainly due to the structural distortion rather than the existence of divalent Fe2+ ions.
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