An EXAFS study of the local structure of the PbxSn1-xS solid solutionстатья
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Дата последнего поиска статьи во внешних источниках: 15 октября 2015 г.
Аннотация:The local environment of the Pb atom in PbxSn1−xS solid solutions with cubic and orthorhombic structures was studied by EXAFS spectroscopy. The shortest Pb-S distance in samples with orthorhombic structure was found to be smaller by ≈0.2 Å than that in cubic-structure samples, which is a sign of stereochemical activity of the two paired 6s2 electrons of the Pb atom. The metal atom arrangement reveals strong short-range order, which results in the formation of-Pb-Sn-Pb-Sn-... zigzag chains aligned with the c axis (in the Pbnm system) in orthorhombic samples. It was shown that the onset of such short-range order in Pb0.5Sn0.5S can initiate the formation of superstructures belonging to the C_2v^2 or C_2v^7 space groups.