Chemical order in the glassy As/sub x/S/sub 1-//sub x/ system: An x-ray-absorption spectroscopy study

Journal Article · Mon May 15 00:00:00 EDT 1989 · Phys. Rev. B: Condens. Matter; (United States)

DOI:https://doi.org/10.1103/PhysRevB.39.10342· OSTI ID:6113992

Yang, C Y; Paesler, M A; Sayers, D E

We have examined chemical ordering in the glassy As/sub x/S/sub 1-//sub x/ system by determining the effect of composition on the local structure of these chalcogenide glasses using x-ray-absorption spectroscopy. Structural changes associated with composition indicate that with increasing S content, the S-rich glasses on the As site have a similar local structure to crystalline As/sub 2/S/sub 3/ (orpiment), but the As-S-As linkages are replaced by As-S-S linkages at higher S concentration. In As-rich glasses a breakdown of the local AsS/sub 3/ configuration is evident and the formation of As-As bonds is observed. Further comparison between As-rich alloys and crystalline As/sub 4/S/sub 4/ (realgar) suggests that a significant fraction of disordered As/sub 4/S/sub 4/ molecular fragments is contained in the As-rich region.

• Research Organization: Department of Physics, North Carolina State University, Raleigh, North Carolina 27695-8202
• OSTI ID: 6113992
• Journal Information: Phys. Rev. B: Condens. Matter; (United States), Vol. 39:14
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ARSENIC SULFIDES
CHEMICAL BONDS
ORDER-DISORDER TRANSFORMATIONS
ABSORPTION SPECTRA
AMORPHOUS STATE
CHALCOGENIDES
COVALENCE
MICROSTRUCTURE
QUANTITY RATIO
STOICHIOMETRY
X-RAY SPECTROSCOPY
ARSENIC COMPOUNDS
CRYSTAL STRUCTURE
PHASE TRANSFORMATIONS
SPECTRA
SPECTROSCOPY
SULFIDES
SULFUR COMPOUNDS
360602* - Other Materials- Structure & Phase Studies