Single-crystal elasticity of the rhodochrosite at high pressure by Brillouin scattering spectroscopy |
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| Authors: | Chaoshuai Zhao Pofei Chen Jianjun Jiang Wen Liang |
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| Affiliation: | 1. Key Laboratory of 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;3. Department of Earth Sciences, National Central University, Taoyuan, Taiwan |
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| Abstract: | ABSTRACTThe sound velocity properties of single-crystal rhodochrosite (MnCO3) were determined up to 9.7?GPa at ambient temperature by Brillouin scattering spectroscopy. Six elastic constants were calculated by a genetic algorithm method using the Christoffel's equations at each pressure. The elastic constants increased linearly as a function of pressure and its pressure derivatives ?Cij/?P for C11, C33, C44, C12, C13, C14 were 5.86 (±0.36), 3.82 (±0.44), 2.06 (±0.39), 5.07 (±0.27), 5.34 (±0.44), 1.52 (±0.24), respectively. Based on the derived elastic constants of rhodochrosite, the aggregate adiabatic bulk and shear moduli (Ks and G) were calculated using the Voigt-Reuss-Hill averages and the linear fitting coefficients (?Ks/?P)T and (?G/?P)T were 5.05(±0.26) and 0.73(±0.05), respectively. The aggregate Vp of rhodochrosite increased clearly as a function of pressure and its pressure derivative ?Vp/?P was 7.99(±0.53)?×?10?2?km/(s?GPa), while the aggregate Vs increased slowly and ?Vs/?P was only 1.19(±0.12)?×?10?2?km/(s?GPa). The anisotropy factor for As of rhodochrosite increased from ～40% at 0.8?GPa to ～48% at 9.7?GPa, while Ap decreased from ～19% to ～16% at the corresponding pressure. |
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| Keywords: | Brillouin scattering sound velocity elasticity rhodochrosite high pressure |
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