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Trabajo presentado a la 15th International Conference on X-ray Absorption Fine Structure (XAFS15) celebrada del 22 al 28 de julio de 2012 en Pekín (China).-- Under the terms of the Creative Commons Attribution (CC BY) licence (creativecommons.org/licenses/by/3.0).Structural and electronic properties of TbMn1-xCoxO3 samples have been characterized by means of x-ray and neutron diffraction and x-ray absorption spectroscopic techniques. Crystallographic structure was refined from diffraction data, and samples show the orthorhombic distorted perovskite structure (Pbnm), being isostructural to TbMnO3, except for x=0.4, 0.5 and 0.6, where an ordered double perovskite structure (P21/n) is found. The electronic configuration of Mn and Co ions was obtained along the series from the chemical shift of the edge on x-ray absorption spectra, at the Mn and Co K-edges. Our results agree with a charge redistribution between Mn and Co ions, yielding a mixed valence state Mn3+/Mn4+ and Co3+/Co2+ for the whole series.The authors thank ESRF and ILL for granting beam time, especially the Spanish CRG BM25, D2B and D1B instruments. Financial support from Spanish MICINN (project FIS08-03951 and MAT2007-61621) and DGA (CAMRADS) is acknowledged.Peer Reviewe

Evolution of Mn and Co oxidation state on TbMn1–xCoxO3 compounds

Evolution of Mn and Co oxidation state on TbMn_1–xCo_xO₃ compounds