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Structural analysis of group V, VI, VII metal compounds by XAFS and DFT calculation

Tetsuya Shishido1, Hiroyuki Asakura1, Seiji Yamazoe2, Kentaro Teramura3 and Tsunehiro Tanaka1

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The characteristics of K, L1 and L3-edges XANES spectra of group IV, V, VI compounds, which have different coordination number, number of d-electrons and the symmetry of coordination sphere, have been classified. Two pd transitions were observed in the second derivative spectra of L3-edge XANES spectra of all group IV, V, VI compounds. These two transitions can be assigned to split d orbitals. The splitting and area of the two resonances depend on the symmetry of coordination sphere because the splitting corresponds to ligand field splitting of d orbitals. The splitting of d orbitals has a correlation with the pre-edge peak area of K or L1-edge XANES spectra, which are attributed to the dipole forbidden transition of sd occurred by mixing of p orbitals with d orbitals. This correlation is supported by DFT calculations of several group IV, V, VI structural models (four-, five- and six-coordinated). The clarification of the correlation between the splitting of the resonance and the structure of group IV, V, VI metal is important to provide structural information in unknown group IV, V, VI metal site.


PACS

61.66.Fn Inorganic compounds

71.20.Ps Other inorganic compounds

71.15.Mb Density functional theory, local density approximation, gradient and other corrections

71.70.Ch Crystal and ligand fields

78.70.Dm X-ray absorption spectra

Subjects

Condensed matter: electrical, magnetic and optical

Condensed matter: structural, mechanical & thermal

Dates

Issue 1 (2009)



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