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Mössbauer and XPS structural study of (Ge, Sn)-As-S glasses

E. SKORDEVA1, V. PAMUKCHIEVA1,* , D. ARSOVA1, P.-E. LIPPENS2, M. WOMES2, J.-C. JUMAS2, M.-F. GUIMON3, D. GONBEAU3

Affiliation

  1. Georgi Nadjakov Institute of Solid State Physics, Bulgarian Academy of Sciences, 72 Tzarigradsko Chaussee Blvd., 1784 Sofia, Bulgaria
  2. LAMMI UMR CNRS 5072, Université Montpellier II, CC015, F-34095 Montpellier France
  3. LCTPCM UMR 5624, Université Pau, 2 Avenue du President Angot, 64053 Pau, France

Abstract

The local structure and the electronic properties of three Ge-As-S glasses are studied by 119Sn Mössbauer and X-ray photoelectron spectroscopies. For the former method, a small fraction of the Ge atoms are substituted by Sn atoms. Mössbauer spectroscopy shows that the glasses contain Sn(IV) and Sn(II) ions with isomer shifts in the range of those found for tin sulphides. The quadrupole splittings found for Sn(IV) and Sn(II) are very different and indicate that Sn(IV) is symmetrically surrounded by S atoms, whereas the local environment of Sn(II) is strongly distorted. Based on these results, and on XPS results obtained for As, Ge and S atoms in the glasses, a simple model describing the local environment of the Sn atoms, and, respectively, of the Ge ones is discussed..

Keywords

Chalcogenide glasses, Mössbauer spectroscopy, XPS, Electronic structure.

Submitted at: Nov. 26, 2006
Accepted at: Aug. 18, 2007

Citation

E. SKORDEVA, V. PAMUKCHIEVA, D. ARSOVA, P.-E. LIPPENS, M. WOMES, J.-C. JUMAS, M.-F. GUIMON, D. GONBEAU, Mössbauer and XPS structural study of (Ge, Sn)-As-S glasses, Journal of Optoelectronics and Advanced Materials Vol. 9, Iss. 8, pp. 2516-2520 (2007)