Chin. Phys. Lett.  2009, Vol. 26 Issue (7): 076101    DOI: 10.1088/0256-307X/26/7/076101
CONDENSED MATTER: STRUCTURE, MECHANICAL AND THERMAL PROPERTIES |
The Phase Transition of Eu2O3 under High Pressures
JIANG Sheng1, BAI Li-Gang1, LIU Jing1, XIAO Wan-Sheng2, LI Xiao-Dong1, LI Yan-Chun1, TANG Ling-Yun1, ZHANG Yu-Feng1, ZHANG De-Chun1, ZHENG Li-Rong1
1Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 1000492Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640
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JIANG Sheng, BAI Li-Gang, LIU Jing et al  2009 Chin. Phys. Lett. 26 076101
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Abstract Pressure-induced phase transition of cubic Eu2O3 is studied by angle-dispersive x-ray diffraction (ADXD) up to 42.3GPa at room temperature. A structural transformation from a cubic phase to a hexagonal phase is observed, which starts at 5.0GPa and finishes at about 13.1GPa. The phase transition leads to a volume collapse of 9.0% at 8.6GPa. The hexagonal phase of Eu2O3 maintains stable up to the highest experiment pressure. After release of pressure, the high-pressure phase transforms to a monoclinic phase. The pressure-volume data are fitted with the Birch-Murnaghan equation of state. The bulk moduli obtained upon compression from the fitting are 145(2)GPa and 151(6)GPa for the cubic and hexagonal phases, respectively, when their first pressure derivatives are fixed at 4.
Keywords: 61.50.Ks      62.50.-p      64.70.K-     
Received: 16 April 2009      Published: 02 July 2009
PACS:  61.50.Ks (Crystallographic aspects of phase transformations; pressure effects)  
  62.50.-p (High-pressure effects in solids and liquids)  
  64.70.K-  
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https://cpl.iphy.ac.cn/10.1088/0256-307X/26/7/076101       OR      https://cpl.iphy.ac.cn/Y2009/V26/I7/076101
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JIANG Sheng
BAI Li-Gang
LIU Jing
XIAO Wan-Sheng
LI Xiao-Dong
LI Yan-Chun
TANG Ling-Yun
ZHANG Yu-Feng
ZHANG De-Chun
ZHENG Li-Rong
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