High temperature extended x-ray absorption fine structure study of multiferroic BiFeO(3) |
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Authors: | V Raghavendra Reddy Carlo Meneghini Deepti Kothari Ajay Gupta Giuliana Aquilanti |
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Institution: | UGC-DAE Consortium for Scientific Research, Khandwa Road, Indore-452001, India. |
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Abstract: | Local atomic structure modifications around Fe atoms in polycrystalline multiferroic BiFeO(3) are studied by Fe K edge x-ray absorption spectroscopy as a function of temperature across the Néel temperature (T(N)?=?643?K) in order to reveal local structure modifications related to the magnetic transition. This work demonstrates that on crossing T(N) the local structure around Fe shows peculiar changes: the Fe-O bond lengths get shorter, the ligand symmetry increases and the Fe-O bond length disorder (σ(2)) deviates from Debye behaviour. These results suggest that the structural transition at the ferroelectric Curie temperature (T(C)?=?1103?K) is anticipated by early local rearrangement of the structure starting already at T(N). |
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