Abstract
Five new isostructural cubic thiogermanates with the formula A 0.5M1.75GeQ4 (A=Ag, Cu, Na; M=Pb, Eu; Q=S, Se) have been prepared by direct combination of stoichiometric amounts of the elements. The compounds crystallize in the noncentrosymmetric space group I-43d with Z=16 and a=14.0291(5) Å for Ag0.5Pb1.75GeS 4, a=14.5949(19) Å for Ag0.5Pb 1.75GeSe4, a=13.9491(14) Å for Ag 0.5Eu1.75GeS4, a = 13.8145(9) Å for Cu0.5Pb1.75GeS4 and a = 14.662(4) Å for Na0.5Pb1.75GeSe4. The adopted structure is similar to that of Ba3CdSn2S8, and features tetrahedral [GeQ4]4- building blocks. These compounds are semiconductors with energy gaps (Eg) ranging from 1.48 to 1.83 eV.
Original language | English (US) |
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Pages (from-to) | 451-459 |
Number of pages | 9 |
Journal | Solid State Sciences |
Volume | 6 |
Issue number | 5 |
DOIs | |
State | Published - May 2004 |
Funding
Financial support from the National Science Foundation (Grant DMR 0127644) is gratefully acknowledged. This work made use of the SEM facilities at the Center for Electron Optics at Michigan State University. We acknowledge the use of the W.M. Keck Microfabrication facility at Michigan State University.
ASJC Scopus subject areas
- General Chemistry
- General Materials Science
- Condensed Matter Physics