Pressure stabilized Se-Se dimer formation in PbSe2

M. Bremholm, Y. S. Hor, R. J. Cava

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10 Scopus citations

Abstract

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) , c = 7.70254(13) , 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 PbSe 2 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.

Original languageEnglish (US)
Pages (from-to)38-41
Number of pages4
JournalSolid State Sciences
Volume13
Issue number1
DOIs
StatePublished - Jan 1 2011

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics

Keywords

  • Diselenide
  • High pressure
  • Lead dichalcogenide
  • Selenium dimer
  • X-ray diffraction

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