Xanes study of trivalent and homogeneous mixed valent rare earth systems |
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| Institution: | 1. Energy & Environment Division, Korea Institute of Ceramic Engineering and Technology (KICET), Jinju 52851, South Korea;2. Department of Chemistry, University of Ulsan, Ulsan 44610, South Korea;3. Department of Education Chemistry and Research Institute of Natural Sciences, Gyeongsang National University, Jinju 52828, South Korea;1. Institut für Anorganische und Analytische Chemie, Westfälische Wilhelms-Universität Münster, Corrensstrasse 28/30, 48149 Münster, Germany;2. Institut für Anorganische Chemie, RWTH Aachen, Landoltweg 1, D-52074 Aachen, Germany;1. Laboratoire de Thermodynamique et Energétique, LTE, Université Ibn-Zohr, B.P.8106, Agadir, Morocco;2. Sustainable Innovation and Applied Research Laboratory, Polytechnic School, International University of Agadir, Agadir, Morocco;3. Laboratoire de Physicochimie de l’Etat Solide, ICMMO, Université Paris-Sud, 91405 Orsay Cedex, France;4. Laboratoire de Mécanique, Procédés de l’Energie et de L’Environnement (LMP2E), ENSA, Agadir, Morocco;5. Laboratoire d’étude Physico-Chimique des Matériaux, Université de Batna 1, Rue Chahid Boukhlouf, 05000 Batna, Algeria;6. Laboratoire Matériaux et Energies Renouvelables (LMER), Faculté des Sciences, Université Ibn Zohr, Agadir, Morocco;1. Institute of Chemical Materials, China Academy of Engineering Physics, Mianyang, 621900, People''s Republic of China;2. Department of Chemistry, University of Alberta, Edmonton, Alberta, T6G 2G2, Canada;3. Center for Crystal Research and Development, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing, 100190, People''s Republic of China;1. Ben-Gurion University of the Negev, Beer-Sheva 84105, Israel;2. Nuclear Research Centre–Negev, P.O. Box 9001, Beer-Sheva 84190, Israel;3. Israel Atomic Energy Commission, Tel Aviv 61070, Israel |
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| Abstract: | We report for the first time a systematic study of X-ray absorption structures 20–30eV above the LIII edge (XANES) of homogeneous mixed valent (SmB6, YbAl2, CePd3...) and trivalent reference Rare-Earth compounds (e.g. GdB6, LaAl2, NdPd3). The XANES of integral valent compounds in simple structures (NaCl, AuCu3...), which is due to multiple scattering of the photoelectron on the neighbouring atomic shells, is characterized by a single peak. On the contrary the XANES of mixed-valent materials presents a splitted structure which replicates the edge structures. We interpret this splitting as a direct evidence for the existence of two threshold energies and corresponding presumably to two different Rare-Earth metal distances in agreement with 4f fluctuations. Finally, we shall propose a consistent picture for core hole spectroscopies (LIII edge, XANES, EXAFS and XPS) in mixed-valent materials. |
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