a Structural Study of Amorphous Copper-Arsenic Triselenide Alloys Using EXAFS
Abstract
Atomic arrangements in amorphous alloys of Cu in As2Se3 were studied using Extended X-Ray Absorption Fine Structure (EXAFS) and a detailed structural model for the glasses was developed. Previous structural studies of this system using X-ray diffraction radial distribution functions (RDF) had determined the average near neighbor coordination numbers and distances for average atoms in these glasses. In an effort to obtain these coordination numbers, studies of EXAFS were initiated. EXAFS is the oscillatory portion of the X-ray absorption coefficient on the high energy side of the X-ray absorption edge. Theoretical analyses indicate that the amplitudes and frequencies of the oscillations are directly related to coordination numbers and coordination distances, respectively, of the atom whose absorption edge is being studied, rather than of an average atom.
- Publication:
-
Ph.D. Thesis
- Pub Date:
- 1977
- Bibcode:
- 1977PhDT........26H
- Keywords:
-
- + EXTENDED X-RAY ABSORPTION FINE-STRUCTURE;
- Physics: Condensed Matter;
- Amorphous Materials;
- Arsenic Alloys;
- Copper Alloys;
- Structural Analysis;
- Atomic Structure;
- Coordination;
- Fine Structure;
- Models;
- X Ray Absorption;
- Solid-State Physics