The stability and Raman spectra of ikaite, CaCO3·6H2O, at high pressure and temperature
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Abstract
Raman analyses of single crystals of ikaite, CaCO3·6H2O, synthesized in a diamond-anvil cell at ambient temperature yield spectra from 0.14 to 4.08 GPa; the most intense peaks are at 228 and 1081 cm−1 corresponding to Eg(external) and A1g (internal) modes of vibrations in CO2− 3 ions, respectively. These are in good agreement with Raman spectra previously published for ikaite in powder form at ambient temperature and pressure. Visual observations of a sample consisting initially of a mixture of calcite + water in a hydrothermal diamond-anvil cell yielded a P-T phase diagram up to 2 GPa and 120 °C; the boundary for the reaction ikaite ↔ aragonite + water has a positive slope and is curved convexly toward the aragonite + water field similar to typical melt curves. This curvature can be explained in terms of the Clapeyron equation for a boundary between a solid phase and a more compressible liquid phase or largely liquid phase assemblage.
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | The stability and Raman spectra of ikaite, CaCO3·6H2O, at high pressure and temperature |
| Series title | American Mineralogist |
| DOI | 10.2138/am.2005.1783 |
| Volume | 90 |
| Issue | 11-12 |
| Year Published | 2005 |
| Language | English |
| Publisher | Mineralogical Society of America |
| Description | 5 p. |
| First page | 1835 |
| Last page | 1839 |
| Online Only (Y/N) | N |
| Additional Online Files (Y/N) | N |
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