Cyclic Phase Transition from Hexagonal to Orthorhombic Then Back to Hexagonal of EuF3 While Loading Uniaxial Pressure and under High Temperature

详细信息    查看全文

• 作者：Zhilei Sui ; Jizhou Wu ; Xiangqi Wang ; Rucheng Dai ; Zhongping Wang ; Xianxu Zheng ; Zengming Zhang
• 刊名：Journal of Physical Chemistry C
• 出版年：2016
• 出版时间：August 25, 2016
• 年：2016
• 卷：120
• 期：33
• 页码：18780-18787
• 全文大小：683K
• 年卷期：0
• ISSN：1932-7455

文摘

The structure and photoluminescence properties are investigated under high pressure and high temperature for pure orthorhombic and hexagonal EuF₃ nanocrystals. Under hydrostatic compression, the hexagonal EuF₃ remains stable at pressures up to 26 GPa. Under nonhydrostatic compression, a cyclic phase transition from hexagonal to orthorhombic and then back to hexagonal is observed for the first time. When loading uniaxial compression, the pure hexagonal EuF₃ partly transforms to orthorhombic at 70 MPa, then the orthorhombic EuF₃ transforms to hexagonal at about 3 GPa, and the transition is completed at about 10 GPa. The cyclic phase transition is also observed during the heating process; the hexagonal transforms to orthorhombic at 550 °C and then to hexagonal at 855 °C. The content phase diagrams are obtained under high pressure and at high temperature.