Extended x-ray absorption fine structure (EXAFS) studies of a soluble Chevrel phase

Autor:	B. A. Averill, B. K. Teo, D. A. Holtman, J. M. Tarascon
Rok vydání:	1987
Předmět:	Inorganic Chemistry Bond length X-ray spectroscopy Molecular geometry Extended X-ray absorption fine structure Chemistry Crystal chemistry Inorganic chemistry Analytical chemistry Crystal structure Physical and Theoretical Chemistry Absorption (chemistry) Spectroscopy
Zdroj:	Inorganic Chemistry. 26:1669-1674
ISSN:	1520-510X 0020-1669
DOI:	10.1021/ic00258a008
Popis:	The structure of the one-dimensional chains within Li2Mo6Se6 in propylene carbonate solution was investigated by means of extended X-ray absorption fine structure (EXAFS) spectroscopy and compared to that of the crystalline M2Mo6Se6 (M = Li, In, Tl) phases. The Fourier-transformed Mo K-edge EXAFS displays three peaks at r' = 2.4, 3.5, and 4.2 A (r' = distance uncorrected for phase shift), while the Fourier-transformed Se K-edge EXAFS exhibits four peaks at 4' = 2.3, 3.5, 4.3, and 4.9 A. The Mo EXAFS was modeled with a theoretical single-electron single-scattering EXAFS equation using a total of five backscattering pairs, and the Se EXAFS was fit with a total of six backscattering pairs. The similarity of the solution- and solid-phase EXAFS spectra of Li2Mo6Se6 indicates that the bulk of the Mo and Se atoms in solution experience an environment indistinguishable from that within the solid phase; this is consistent with retention of, essentially, unaltered (Mo3Se3 )/sub infinity/ strands in solution.
Databáze:	OpenAIRE
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