Preparation, transport properties, and electronic structure of quaternary sulfides based on tetrahedral [MS4](4)- units: SrCu2MS4 (M=Ge, Sn)

Authors
Llanos, J Mujica, C Buljan, A
Citation
J. Llanos et al., Preparation, transport properties, and electronic structure of quaternary sulfides based on tetrahedral [MS4](4)- units: SrCu2MS4 (M=Ge, Sn), J ALLOY COM, 316(1-2), 2001, pp. 146-152
Citations number
29
Categorie Soggetti
Apllied Physucs/Condensed Matter/Materiales Science
Journal title
JOURNAL OF ALLOYS AND COMPOUNDS
ISSN journal
09258388 → ACNP
Volume
316
Issue
1-2
Year of publication
2001
Pages
146 - 152
Database
ISI
SICI code
0925-8388(20010302)316:1-2<146:PTPAES>2.0.ZU;2-N
Abstract
The electrical and optical properties of the trigonal phases SrCu2GeS4 and SrCu2SnS4 were studied by means of electrical conductivity and diffuse refl ectance spectra in the W-Vis range. The compounds exhibit a room temperatur e conductivity of 8.96><10(-4) S cm(-1) for SrCu2GeS4 and 5.01x10(-1) S cm( -1) for SrCu2SnS4. The optical bandgaps were assessed at 2.9 and 2.1 eV, re spectively. Electronic structure and bonding relationships were analyzed by means of extended Huckel tight-binding calculations. Based on the experime ntal results as well as the electronic structure calculations, both phases are classified as semiconductor materials. (C) 2001 Elsevier Science B.V. A ll rights reserved.