Abstract
The local lead-atom environment in the PbxSn1−xS solid solutions with cubic and orthorhombic structure was studied by EXAFS spectroscopy. The shortest Pb-S distance in samples with orthorhombic structure was found to be smaller by ≈0.2 A than that in cubic-lattice samples, which is a sign of stereochemical activity of the two paired 6s2 electrons of a 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.
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