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Title: Phase Diagram of Carbon Dioxide: Evidence for a New Associated Phase

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.

Authors:
;
Publication Date:
Research Org.:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org.:
(US)
OSTI Identifier:
40277917
DOE Contract Number:  
W-7405-ENG-48
Resource Type:
Journal Article
Journal Name:
Physical Review Letters
Additional Journal Information:
Journal Volume: 86; Journal Issue: 26; Other Information: DOI: 10.1103/PhysRevLett.86.5922; Othernumber: PRLTAO000086000026005922000001; 013124PRL; PBD: 25 Jun 2001; Journal ID: ISSN 0031-9007
Publisher:
The American Physical Society
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; AMBIENT TEMPERATURE; CARBON DIOXIDE; CONFIGURATION; PHASE DIAGRAMS; RAMAN SPECTROSCOPY; STABILITY

Citation Formats

Iota, Valentin, and Yoo, Choong-Shik. Phase Diagram of Carbon Dioxide: Evidence for a New Associated Phase. United States: N. p., 2001. Web. doi:10.1103/PhysRevLett.86.5922.
Iota, Valentin, & Yoo, Choong-Shik. Phase Diagram of Carbon Dioxide: Evidence for a New Associated Phase. United States. doi:10.1103/PhysRevLett.86.5922.
Iota, Valentin, and Yoo, Choong-Shik. Mon . "Phase Diagram of Carbon Dioxide: Evidence for a New Associated Phase". United States. doi:10.1103/PhysRevLett.86.5922.
@article{osti_40277917,
title = {Phase Diagram of Carbon Dioxide: Evidence for a New Associated Phase},
author = {Iota, Valentin and Yoo, Choong-Shik},
abstractNote = {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.},
doi = {10.1103/PhysRevLett.86.5922},
journal = {Physical Review Letters},
issn = {0031-9007},
number = 26,
volume = 86,
place = {United States},
year = {2001},
month = {6}
}