Pressure-induced phase transition of B-type Y_2O_3 |
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| Affiliation: | 1.Gemological Institute, China University of Geosciences, Wuhan 430074, China;2.State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, Wuhan 430074, China;3.Key Laboratory of Orogenic Belts and Crustal Evolution, Ministry of Education & School of Earth and Space Sciences, Peking University, Beijing 100871, China |
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| Abstract: | The synthesized monoclinic (B-type) phase of Y2O3 has been investigated by in situ angle-dispersive x-ray diffraction in a diamond anvil cell up to 44 GPa at room temperature. A phase transition occurs from monoclinic (B-type) to hexagonal (A-type) phase at 23.5 GPa and these two phases coexist even at the highest pressure. Parameters of isothermal equation of state are V0=69.0(1) Å3, K0=159(3) GPa, K0'=4 (fixed) for the B-type phase and V0=67.8(2) Å3, K0=156(3) GPa, K0'=4 (fixed) for the A-type phase. The structural anisotropy increases with increasing pressure for both phases. |
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| Keywords: | Y2O3 x-ray diffraction pressure-induced phase transition equation of state |
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