title: High pressure transition in amorphous As(2)S(3) studied by EXAFS.
abstract: 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.
authors.affiliation: European Synchrotron Radiation Facility, 6 Rue Jules Horowitz, B.P. 220, 38043 Grenoble Cedex, France. vaccari@esrf.fr
authors.forename: M
authors.initials: M
authors.lastname: Vaccari
authors.forename: G
authors.initials: G
authors.lastname: Garbarino
authors.forename: S N
authors.initials: SN
authors.lastname: Yannopoulos
authors.forename: K S
authors.initials: KS
authors.lastname: Andrikopoulos
authors.forename: S
authors.initials: S
authors.lastname: Pascarelli