Z. Hu, H. Lips, M. Golden, J. Fink, G. Kaindl, F. Groot, S. Ebbinghaus, A. Reller
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引用次数: 65
Abstract
We report combined experimental and theoretical investigations of x-ray absorption at the $\mathrm{Ru}{\ensuremath{-}L}_{2,3}$ and O-K thresholds of the Ru(IV) compounds ${\mathrm{RuO}}_{2}$ and ${\mathrm{Sr}}_{2}{\mathrm{RuO}}_{4}$ and of the Ru(V) compound ${\mathrm{Sr}}_{4}{\mathrm{Ru}}_{2}{\mathrm{O}}_{9}.$ Significant differences in the intensity distribution of the ${t}_{2g}$-related and ${e}_{g}$-related peaks between the ${L}_{3}$ and the ${L}_{2}$ edges are found, due to the combined effects of $4d$ spin-orbit coupling and the interelectronic Coulomb interaction described by the Slater integrals. The observed spectral features can be well reproduced by crystal-field-multiplet calculations. With increasing the Ru valence from IV to V, the spectra are shifted by \ensuremath{\cong}1.5 eV to higher energy at the $\mathrm{Ru}{\ensuremath{-}L}_{2,3}$ edges and \ensuremath{\cong}1.0 eV to lower energy at the O-K edge, which is of the same order of magnitude as on going from the divalent to the trivalent late $3d$ transition-metal oxides.
期刊介绍:
Catalysis Reviews is dedicated to fostering interdisciplinary perspectives in catalytic science and engineering, catering to a global audience of industrial and academic researchers. This journal serves as a bridge between the realms of heterogeneous, homogeneous, and bio-catalysis, providing a crucial and critical evaluation of the current state of catalytic science and engineering. Published topics encompass advances in technology and theory, engineering and chemical aspects of catalytic reactions, reactor design, computer models, analytical tools, and statistical evaluations.