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.
Suggested Citation
Shahar, A., Bassett, W.A., Mao, H., Chou, I., and Mao, W., 2005, The stability and Raman spectra of ikaite, CaCO3·6H2O, at high pressure and temperature: American Mineralogist, v. 90, no. 11-12, p. 1835-1839, https://doi.org/10.2138/am.2005.1783.
| 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 |