期刊
JOURNAL OF CHEMICAL PHYSICS
卷 131, 期 22, 页码 -出版社
AIP Publishing
DOI: 10.1063/1.3269045
关键词
amorphous state; arsenic compounds; bond lengths; EXAFS; glass; glass transition; high-pressure solid-state phase transformations; vitreous state; X-ray chemical analysis
资金
- European Synchrotron Radiation Facility (ESRF)
- European Union-European Social Fund
- Greek State, Ministry of Development-GSRT
We report an in situ high pressure investigation of the structural change in vitreous As2S3 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.
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