X-ray absorption study of the Ge-Se system . II. GeSey glasses: Bulk and thin film samples</SBT>
Abstract
EXAFS measurements on {Se}/{Ge} ratios greater than 2 have been undertaken for different forms of the GeSe y family, bulk or thin films. Data analysis was made both at the Ge and Se K edges and special attention was first paid to the effect of the grain size on the absorption amplitude. The results of the various investigations led to the conclusions that if the germanium tetrahedral environment is constant, that of selenium varies strongly between (i) GeSe 3 and GeSe y, y > 3, and (ii) bulk phases and thin films. A model taking into account these differences is discussed, explaining these changes by the existence of selenium clustering in the more enriched Se compositions.
- Publication:
-
Journal of Solid State Chemistry France
- Pub Date:
- September 1989
- DOI:
- 10.1016/0022-4596(89)90225-9
- Bibcode:
- 1989JSSCh..82...78P