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Author Iota, Valentin ♦ Yoo, Choong-Shik
Sponsorship (US)
Source United States Department of Energy Office of Scientific and Technical Information
Content type Text
Publisher The American Physical Society
Language English
Subject Keyword CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS ♦ AMBIENT TEMPERATURE ♦ CARBON DIOXIDE ♦ CONFIGURATION ♦ PHASE DIAGRAMS ♦ RAMAN SPECTROSCOPY ♦ STABILITY
Abstract The stability of CO{sub 2} phases has been investigated up to 50GPa and 750K by in situ Raman spectroscopy and visual observations using externally heated diamond-anvil cells. A new phase (CO{sub 2} -II) exists above 20GPa and 500K, which can be quenched to ambient temperature. The vibrational spectrum of this new CO{sub 2} polymorph suggests the dimeric pairing of molecules. Based on the present in situ data and previous laser-heating results, we present new constraints for the phase diagram of carbon dioxide to 50GPa and 2000K. We find that carbon dioxide exhibits dramatic changes, both in the molecular configuration and in the nature of intermolecular interaction at high pressures and temperatures.
ISSN 00319007
Educational Use Research
Learning Resource Type Article
Publisher Date 2001-06-25
Publisher Department Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Publisher Place United States
Journal Physical Review Letters
Volume Number 86
Issue Number 26
Organization Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)


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