Water-carbon dioxide solid phase equilibria at pressures above 4 GPa
A solid phase in the mixed water-carbon dioxide system, previously identified as carbonic acid, was observed in the high-pressure diamond-anvil cell. The pressure-temperature paths of both its melting and peritectic curves were measured, beginning at 4.4GPa and 165°C (where it exists in a quadruple...
| Published in: | Scientific Reports |
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| Main Authors: | , , |
| Language: | unknown |
| Published: |
2023
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| Subjects: | |
| Online Access: | http://www.osti.gov/servlets/purl/1624284 https://www.osti.gov/biblio/1624284 https://doi.org/10.1038/s41598-017-00915-0 |
| Summary: | A solid phase in the mixed water-carbon dioxide system, previously identified as carbonic acid, was observed in the high-pressure diamond-anvil cell. The pressure-temperature paths of both its melting and peritectic curves were measured, beginning at 4.4GPa and 165°C (where it exists in a quadruple equilibrium, together with an aqueous fluid and the ices H2O(VII) and CO2(I)) and proceeding to higher pressures and temperatures. Single-crystal X-ray diffraction revealed a triclinic crystal with unit cell parameters (at 6.5GPa and 20°C) of a=5.88Å, b=6.59Å, c=6.99Å, α=88.7°, β=79.7°, and γ=67.7°. Raman spectra exhibit a major line at ~1080cm-1 and lattice modes below 300cm-1. |
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