Pressure Stabilized Se-Se Dimer Formation in PbSe₂

Author

Martin Bremholm
Yew San Hor, Missouri University of Science and TechnologyFollow
Robert Joseph Cava

Abstract

The preparation of PbSe₂ through the reaction of PbSe with excess Se at 4.5 GPa and 650 :deg: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 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.

Recommended Citation

M. Bremholm et al., "Pressure Stabilized Se-Se Dimer Formation in PbSe₂," Solid State Sciences, vol. 13, no. 1, pp. 38 - 41, Elsevier, Jan 2011.

The definitive version is available at https://doi.org/10.1016/j.solidstatesciences.2010.10.003

Department(s)

Physics

Keywords and Phrases

Dimer Formation; Diselenide; Divalent Metals; Doped Sample; High Pressure; Highest Temperature; Linear Behavior; Magnetic Ordering; Magnetic Susceptibility Measurements; Metallic Resistivity; Numerical Values; Structure Type; Chalcogenides; Diffraction; Lead; Magnetic Susceptibility; Rare Earth Compounds; Selenium; Selenium Compounds; X Ray Diffraction; X Ray Powder Diffraction; X Rays; Crystal Structure

International Standard Serial Number (ISSN)

1293-2558

Document Type

Article - Journal

Document Version

Citation

File Type

text

Language(s)

English

Rights

© 2011 Elsevier, All rights reserved.

Publication Date

01 Jan 2011