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X‐ray absorption spectroscopy analysis of Ru in La 2 RuO 5
Author(s) -
Arčon Iztok,
Benčan Andreja,
Kodre Alojz,
Kosec Marija
Publication year - 2007
Publication title -
x‐ray spectrometry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.447
H-Index - 45
eISSN - 1097-4539
pISSN - 0049-8246
DOI - 10.1002/xrs.946
Subject(s) - xanes , extended x ray absorption fine structure , valence (chemistry) , x ray absorption spectroscopy , absorption spectroscopy , chemistry , surface extended x ray absorption fine structure , spectroscopy , coordination number , crystallography , rietveld refinement , x ray absorption fine structure , crystal structure , absorption (acoustics) , analytical chemistry (journal) , materials science , ion , physics , optics , organic chemistry , chromatography , quantum mechanics , composite material
The compound La 2 RuO 5 was examined by the x‐ray absorption spectroscopy (XAS) methods, x‐ray absorption near edge structure (XANES) and extended x‐ray absorption fine structure (EXAFS). XANES technique was used to probe directly the average valence of Ru atoms in the compound. The energy shift of the Ru K‐edge in the XANES signal gave the average Ru valence state as 4.0 ± 0.1. EXAFS analysis provided, by yielding directly the interatomic distances and coordination numbers, the first information on the Ru atom neighborhood, on which the model for the Rietveld refinement of the unit cell of the new compound was devised. Finally, the local structure around the Ru atoms from the refinement was used in the FEFF6 code for a model EXAFS spectrum. The very good quantitative agreement with the measured spectrum proves that the refined crystal structure contains no systematic defects in the vicinity of Ru atoms. This result, together with the valence obtained from XANES, strongly confirms the proposed La 2 RuO 5 stoichiometry. Copyright © 2007 John Wiley & Sons, Ltd.