As sub x Se sub 1 minus x system (0. 20 le x le 0. 57): EXAFS study of the glass region

Journal Article · Sat Feb 01 04:00:00 EST 1992 · Journal of Solid State Chemistry; (United States)

DOI:https://doi.org/10.1016/S0022-4596(05)80263-4· OSTI ID:7292111

Mastelaro, V; Dexpert, H; Benazeth, S ^[1]; Ollitrault-Fichet, R ^[2]

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1. Univ. Paris XI, Orsay (France)
2. Univ. Paris V, Paris (France)

The authors have examined the local structure of the As{sub x}Se{sub 1{minus}x}(0.20{le}x{le}0.57) system by Extended X-ray Absorption Fine Structure (EXAFS) measurements. The two atoms have been successively excited, with both showing a unique contribution for their radial distribution function. At the arsenic K edge, the one shell fit is consistent with the presence of pyramidal AsSe{sub 3} building units, bridged by selenium atoms, as indicated by the data analyzed at the selenium K edge. The evolution of the Debye-Waller factor at the arsenic K edge is discussed as well as the variation of the Se-As distance observed at the selenium edge, both phenomena depending on the arsenic composition. These effects can be explained by the existence of some As-As and Se-Se homopolar bonds in the arsenic- and selenium-rich glasses, respectively. The Fourier transform magnitude from the data collected at 35 K at the arsenic K edge does not show other shells than the first As-Se principal peak. The qualitative interpretation of the XANES part of the absorption spectra is in good agreement with the present structural investigation.

• OSTI ID: 7292111
• Journal Information: Journal of Solid State Chemistry; (United States), Journal Name: Journal of Solid State Chemistry; (United States) Vol. 96:2; ISSN 0022-4596; ISSN JSSCB
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360602 -- Other Materials-- Structure & Phase Studies
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400101* -- Activation
Nuclear Reaction
Radiometric & Radiochemical Procedures
400201 -- Chemical & Physicochemical Properties
ABSORPTION SPECTROSCOPY
ARSENIC COMPOUNDS
ARSENIC SELENIDES
CHALCOGENIDES
DATA
EXPERIMENTAL DATA
INFORMATION
MOLECULAR STRUCTURE
NUMERICAL DATA
SELENIDES
SELENIUM COMPOUNDS
SPECTROSCOPY
X-RAY SPECTROSCOPY