Phase Transition and vibration properties of MnCO3 at high pressure and high-temperature by Raman spectroscopy |
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| Authors: | Chaoshuai Zhao Jianjun Jiang Yu He Wen Liang |
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| Institution: | 1. Key Laboratory for High-temperature and High pressure Study of the Earth’s Interior, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang, People’s Republic of China;2. College of Earth Sciences, University of Chinese Academy of Sciences, Beijing, People’s Republic of China |
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| Abstract: | The high pressure and high-temperature behavior of MnCO3 was investigated up to 55?GPa at ambient temperature and up to 573?K at ambient pressure by Raman spectroscopy, respectively. Some new modes were detected at ～16 and ～32?GPa, which were assigned to MnCO3-I below 16?GPa and to MnCO3-II above 32?GPa, and to a coexisting phase of them in between. The high pressure vibration properties of all Raman modes, especially high frequency modes, were systematically reported. The coexisting phase of MnCO3-I and MnCO3-II had much easier compressibility than the MnCO3-II phase. The thermal stability of MnCO3 was at least to 573?K and its thermal expansion along the c axis was easier than a and b axes. |
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| Keywords: | Rhodochrosite Raman spectroscopy high pressure high-temperature phase transition |
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