1. Local structure ofAsxTe100−xglasses studied by differential x-ray anomalous scattering and x-ray-absorption spectroscopy
- Author
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Ma Q, Raoux D, and Bénazeth S
- Subjects
X-ray absorption spectroscopy ,Materials science ,chemistry ,Anomalous scattering ,Extended X-ray absorption fine structure ,Coordination number ,Analytical chemistry ,chemistry.chemical_element ,Tellurium ,Spectroscopy ,Chemical composition ,Solid solution - Abstract
The local structure of As x Te 100-x glassy semiconductors has been studied using x-ray anomalous scattering and x-ray-absorption spectroscopy as a function of the composition. Two important findings are (a) tellurium (Te) atoms are twofold coordinated in arsenic (As) rich alloys (x>40), while the Te coordination suddenly increases to 2.4 at the stoichiometric As 40 Te 60 composition, which indicates a large fraction (about 50%) of threefold Te sites in this glass. This percentage of occupancy of the threefold Te sites remains almost constant with increasing further the Te concentration; (b) a significant level of chemical disorder, marked by the existence of homopolar As-As and Te-Te pairs in the first coordination shell, is observed for all the investigated glasses
- Published
- 1993