Phase diagram of calcium at high pressure and high temperature
Phase diagram of calcium at high pressure and high temperature
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DOI：
10.1103/physrevmaterials.2.083608
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发表时间：
2018-08-30
影响因子：
3.4
通讯作者：
Wilson, C. W.
中科院分区：
文献类型：
--
作者：
Anzellini, S.;Errandonea, D.;Wilson, C. W.
用电阻加热金刚石对顶砧装置和同步辐射X射线衍射技术研究了钙在50 GPa和800 K下的相图。在这些压力-温度条件下，已经确定了Ca-I（面心立方），Ca-II（体心立方）和Ca-III（简单立方，sc）相之间的相边界，并生成了环境温度状态方程。由实验测得的相的压缩曲线，用三阶Birch-Murnaghan方程和Vinet方程确定了室温下的状态参数方程。通过将室温Birch-Murnaghan状态方程与Berman型热膨胀模型相结合，还确定了Ca-I和Ca-II的热状态方程。
Resistively heated diamond-anvil cells have been used together with synchrotron x-ray diffraction to investigate the phase diagram of calcium up to 50 GPa and 800 K. The phase boundaries between the Ca-I (fcc), Ca-II (bcc), and Ca-III (simple cubic, sc) phases have been determined at these pressure-temperature conditions, and the ambient temperature equation of state has been generated. The equation of state parameters at ambient temperature have been determined from the experimental compression curve of the observed phases by using third-order Birch-Murnaghan and Vinet equations. A thermal equation of state was also determined for Ca-I and Ca-II by combining the room-temperature Birch-Murnaghan equation of state with a Berman-type thermal expansion model.