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 language | English (US) |
---|---|
Pages (from-to) | 38-41 |
Number of pages | 4 |
Journal | Solid State Sciences |
Volume | 13 |
Issue number | 1 |
DOIs | |
State | Published - Jan 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