Journal
PHYSICAL REVIEW B
Volume 82, Issue 1, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.82.012105
Keywords
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Funding
- NSF [DMR 0854618]
- DOE-NNSA [DE-F603-97SF21388]
- Division Of Materials Research
- Direct For Mathematical & Physical Scien [854618] Funding Source: National Science Foundation
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We report recent findings of coesite-like carbon dioxide phases: coesite I phase (cI-CO2) formed by laser-heating pseudo-six-fold phase VI above 50 GPa, a high-pressure form of coesite (cII-CO2) by further compressing cI phase above 70 GPa, and an amorphous form above 100 GPa. The existence of coesite-like carbon dioxide, an important linkage between fourfold quartz and sixfold stishovite in SiO2, underscores the periodic analogy between SiO2 and CO2, which has been in a recent controversy. Its pressure-temperature stability field signifies the possibility of volatile CO2 incorporated in silicate minerals in the Earth's lower mantle.
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