کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1505457 993764 2011 4 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Pressure stabilized Se–Se dimer formation in PbSe2
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد سرامیک و کامپوزیت
پیش نمایش صفحه اول مقاله
Pressure stabilized Se–Se dimer formation in PbSe2
چکیده انگلیسی

The preparation of PbSe2 through the reaction of PbSe with excess Se at 4.5 GPa and 650 °C is reported. The crystal structure, determined from X-ray powder diffraction data (CuAl2 structure type, I4/mcm (#140), a = 6.42695(11) Å, c = 7.70254(13) Å, Z = 4), consists of layers of [Se2]2- dimers with Pb2+ in square antiprismatic coordination with Se. This is a rare crystal structure for divalent metal chalcogenides, previously only identified for SrS2 and BaTe2. Undoped PbSe2 as well as Bi3+- and Ag+-doped samples (10% Pb substitution) show semi-metallic resistivity down to 0.4 K. Magnetic susceptibility measurement of PbSe2 shows no magnetic ordering above 1.8 K. The Seebeck coefficients show nearly linear behavior from 35 to 400 K and the largest numerical values are found in the case of undoped PbSe2, + 99 μVK−1, and Bi3+-doped PbSe2, - 146 μVK−1, at the highest temperature measured, 400 K.

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ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Solid State Sciences - Volume 13, Issue 1, January 2011, Pages 38–41
نویسندگان
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