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Carbon Dioxide at High Pressure and Temperature
Author(s) -
Iota V.,
Yoo C.S.
Publication year - 2001
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/1521-3951(200101)223:2<427::aid-pssb427>3.0.co;2-q
Subject(s) - tridymite , raman spectroscopy , carbon dioxide , molecule , materials science , covalent bond , bent molecular geometry , tetrahedron , cristobalite , phase (matter) , crystallography , chemical physics , chemistry , quartz , organic chemistry , composite material , physics , optics
We present a review of recent studies of carbon dioxide (CO 2 ) at high pressures and temperatures and describe the experimental evidence for a dipole interacting bent CO 2 phase IV and for a non‐molecular extended phase V. Phase IV is stabilized above 12 GPa and 1000 K; the Raman activation of the internal bending mode ( ν 2 ) indicates a loss of molecular inversion symmetry in this new phase. Above 35 GPa, and 1800 K, the CO 2 molecules associate to form a covalent solid (V) with a structure based on singly bonded CO 4 tetrahedra, similar to that of SiO 2 tridymite. We discuss the stability and properties of this polymeric form of CO 2 .