Compressibility and phase transition of intermetallic compound Fe2Ti
Compressibility and phase transition of intermetallic compound Fe2Ti
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DOI：
10.1016/j.jallcom.2013.01.052
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发表时间：
2013-05
影响因子：
6.2
通讯作者：
Ye Wu;Xiang Wu;S. Qin;Ke Yang
中科院分区：
文献类型：
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作者：
Ye Wu;Xiang Wu;S. Qin;Ke Yang
用同步辐射金刚石压砧X射线衍射研究了Fe_2 Ti（P_（63）/mmc）的结构稳定性。在室温下，Fe_2 Ti在40.3GPa以下的压力范围内，晶胞体积呈单调变化。Fe_2Ti（P_63/mmc）的等温压力-体积关系可用二阶Birch-Murnaghan状态方程描述，其V_0 =161.8（3）GPa，B_0 =201（4）GPa。在46.6GPa下激光加热高温退火后，观察到Fe_2Ti的一种新的多晶型，该多晶型为正交相。这种斜方晶相可以在减压至环境压力时淬灭和保存。
The structural stability of Fe2Ti (P63/mmc) has been investigated by synchrotron radiation X-ray diffraction with diamond anvil cell. At room temperature, Fe2Ti shows a monotonous change of unit-cell volume in present pressure range up to 40.3GPa. Isothermal pressure–volume relationship of Fe2Ti (P63/mmc) is well described by the second order Birch–Murnaghan equation of state with V0=161.8(3)Å3and B0=201(4)GPa. A new polymorph of Fe2Ti indexed to an orthorhombic phase is observed when the sample undergoes the high-temperature annealing using laser heating at 46.6GPa. This orthorhombic phase can be quenched and preserved on decompressing to ambient pressure.