X-Ray absorption spectroscopic study on LaPdO3
Idioma
en
Article de revue
Este ítem está publicado en
Journal of Materials Chemistry. 2002, vol. 12, n° 4, p. 995-1000
Royal Society of Chemistry
Resumen en inglés
Pd L-edge XANES and Pd K-edge XANES/EXAFS have been studied to investigate the electronic configuration and local structure of Pd in a new perovskite LaPdO3, which was prepared under high pressure. A white line in the Pd ...Leer más >
Pd L-edge XANES and Pd K-edge XANES/EXAFS have been studied to investigate the electronic configuration and local structure of Pd in a new perovskite LaPdO3, which was prepared under high pressure. A white line in the Pd L-edge XANES for LaPdO3 is positioned just in the middle of those for divalent (PdIIO) and tetravalent (Zn2PdIVO4) palladates. The peak intensity for LaPdO3 is also in-between those for PdO and Zn2PdO4. Pd K-edge XANES spectra for PdO is characterized by a shoulder in the threshold edge due to the planar square coordination of Pd. The absence of such a shoulder in Pd K-edge XANES spectra for LaPdO3 and Zn2PdIVO4 suggests a nearly regular octahedral symmetry of (PdO6) in both structures. These XANES results underline that the palladium ions with an oxidation state of III are stabilized with the electronic configuration, t2g6σ*1 in LaPdO3. The Pd K-edge EXAFS analysis confirms that (PdO6) octahedra in LaPdO3 are nearly isotropic and the average PdIII-O bond distance is 2.064 Å, which is compatible with the average PdIII-F bond distance (2.00 Å) estimated from a recent EXAFS study on trivalent palladium fluoride.< Leer menos
Palabras clave en inglés
X-ray absorption spectroscopy
Lanthanum
Palladium
Oxides
Orígen
Importado de HalCentros de investigación