期刊
JOURNAL OF APPLIED PHYSICS
卷 113, 期 11, 页码 -出版社
AMER INST PHYSICS
DOI: 10.1063/1.4795504
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资金
- National Natural Science Foundation of China [11079040, 11104307, 11075200]
- National Basic Research Program of China [2011CB808200]
- Chinese Academy of Sciences [KJCX2-SW-N20, KJCX2-SW-N03]
The structural phase transitions in Sm2O3 with mixed phases of cubic and monoclinic as starting material were studied by in situ high-pressure synchrotron angle dispersive x-ray diffraction and Raman scattering measurements up to 40.1 GPa and 41.0 GPa, respectively. The x-ray diffraction data indicate that the monoclinic and cubic phases begin to transform to a hexagonal phase at 2.5 and 4.2 GPa, respectively. The hexagonal phase is stable up to at least 40.1 GPa and could not be quenched to ambient conditions. These phase transitions have also been confirmed by Raman spectroscopy. A third-order Birch-Murnaghan fit based on the observed pressure-volume data yields zero pressure bulk moduli B-0 = 149(2), 153(7), and 155(5) GPa for cubic, monoclinic, and hexagonal phases, respectively, when their first pressure derivatives (B'(0)) were fixed as 4. The pressure coefficients of Raman peaks and the mode Gruneisen parameters of different Raman modes were also obtained. Coupled with previous results, we conclude that the transition pressure of medium rare-earth sesquioxides from the cubic and monoclinic to the hexagonal phase increase with the decreasing of the cation radius. (C) 2013 American Institute of Physics. [http://dx.doi.org/10.1063/1.4795504]
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