High-pressure compressibility and vibrational properties of (Ca,Mn)CO<sub>3</sub> [electronic resource].
- Washington, D.C. : United States. Dept. of Energy, 2016. and Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy
- Physical Description:
- pages 2,723-2,730 : digital, PDF file
- Additional Creators:
- SLAC National Accelerator Laboratory, United States. Department of Energy, and United States. Department of Energy. Office of Scientific and Technical Information
- Knowledge of potential carbon carriers such as carbonates is critical for our understanding of the deep-carbon cycle and related geological processes within the planet. Here we investigated the high-pressure behavior of (Ca,Mn)CO<sub>3</sub> up to 75 GPa by synchrotron single-crystal X-ray diffraction, laser Raman spectroscopy, and theoretical calculations. MnCO<sub>3</sub>-rich carbonate underwent a structural phase transition from the CaCO<sub>3</sub>-I structure into the CaCO<sub>3</sub>-VI structure at 45–48 GPa, while CaCO<sub>3</sub>-rich carbonate transformed into CaCO<sub>3</sub>-III and CaCO<sub>3</sub>-VI at approximately 2 and 15 GPa, respectively. The equation of state and vibrational properties of MnCO<sub>3</sub>-rich and CaCO<sub>3</sub>-rich carbonates changed dramatically across the phase transition. The CaCO<sub>3</sub>-VI-structured CaCO<sub>3</sub>-rich and MnCO<sub>3</sub>-rich carbonates were stable at room temperature up to at least 53 and 75 GPa, respectively. In conclusion, the addition of smaller cations (e.g., Mn<sup>2+</sup>, Mg<sup>2+</sup>, and Fe<sup>2+</sup>) can enlarge the stability field of the CaCO<sub>3</sub>-I phase as well as increase the pressure of the structural transition into the CaCO<sub>3</sub>-VI phase.
- Published through SciTech Connect., 12/01/2016., American Mineralogist 101 12 ISSN 0003-004X AM, and Jin Liu; Razvan Caracas; Dawei Fan; Ema Bobocioiu; Dongzhou Zhang; Wendy L. Mao.
- Funding Information:
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