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- W2896522811 abstract "Abstract PbS2 and Pb0.9Ag0.1S2 were prepared through the reaction of PbS with excess sulfur (and silver) at 4 GPa and 600 °C. PbS2 crystallizes in the CuAl2 structure type, (I4/mcm (#140), a = 6.1106(5) A, c = 7.4949(6) A, Z = 4), determined by single crystal X-ray diffraction. Its structure consists of layers of [S2]2- dimers and Pb2+ in square antiprismatic coordination – a rare structure type for metal dichalcogenides. Electronic structure calculations suggest that the material should be an indirect band gap semiconductor. Consistent with the calculations, the temperature-dependent resistivity of undoped PbS2 is that of a degenerate semiconductor, while the Ag-doped material shows metallic temperature dependent resistivity down to 2 K. The materials are both diamagnetic. For the Ag-doped material, the Seebeck coefficient is small and shows nearly linear temperature-dependent behavior from 50 to 250 K." @default.
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- W2896522811 date "2019-01-01" @default.
- W2896522811 modified "2023-10-16" @default.
- W2896522811 title "Crystal structure and elementary properties of PbS2 with a pressure–stabilized S-S dimer" @default.
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- W2896522811 doi "https://doi.org/10.1016/j.jssc.2018.10.023" @default.
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