High pressure transition in amorphous As(2)S(3) studied by EXAFS

We report an in situ high pressure investigation of the structural change in vitreous As(2)S(3) up to 60 GPa using the diamond anvil cell and energy dispersive x-ray absorption spectroscopy. The main finding of the present study is a gradual elongation of the average As-S bond length, which takes pl...

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Bibliographic Details
Published in:The Journal of chemical physics 2009-12, Vol.131 (22), p.224502-224502
Main Authors: Vaccari, M, Garbarino, G, Yannopoulos, S N, Andrikopoulos, K S, Pascarelli, S
Format: Article
Language:English
Subjects:
ABSORPTION
ABSORPTION SPECTROSCOPY
AMORPHOUS STATE
ARSENIC COMPOUNDS
ARSENIC SULFIDES
ATOMS
BOND LENGTHS
CARBON
CHALCOGENIDES
CHEMICAL ANALYSIS
COORDINATION NUMBER
DEFORMATION
DIAMONDS
DIMENSIONS
ELECTROMAGNETIC RADIATION
ELEMENTS
ELONGATION
FINE STRUCTURE
GLASS
INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY
IONIZING RADIATIONS
K ABSORPTION
LENGTH
MATERIALS SCIENCE
MINERALS
NONMETALS
PHASE TRANSFORMATIONS
PRESSURE RANGE
PRESSURE RANGE GIGA PA
PRESSURE RANGE MEGA PA
PRESSURE RANGE MEGA PA 10-100
PRESSURE RELEASE
RADIATIONS
SOLIDS
SORPTION
SPECTROSCOPY
SULFIDES
SULFUR COMPOUNDS
X RADIATION
X-RAY SPECTROSCOPY
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Summary:We report an in situ high pressure investigation of the structural change in vitreous As(2)S(3) up to 60 GPa using the diamond anvil cell and energy dispersive x-ray absorption spectroscopy. The main finding of the present study is a gradual elongation of the average As-S bond length, which takes place in the pressure range of 15-50 GPa. This change is interpreted as a signature of the coordination number increase around As atoms. The negative shift of the As K absorption edge position confirms the progressive metallization of the glass at high pressure. The observed changes are reversible after pressure release.
ISSN:0021-9606
1089-7690
DOI:10.1063/1.3269045