Melting of the alkaline-earth metals to 80 GPa
Melting of the alkaline-earth metals to 80 GPa
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DOI：
10.1103/physrevb.65.012108
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发表时间：
2002-01-01
影响因子：
3.7
通讯作者：
Ross, M
中科院分区：
文献类型：
--
作者：
Errandonea, D;Boehler, R;Ross, M
Mg，Ca，Sr和Ba的熔化曲线在激光加热的金刚石压砧单元中测量到80 GPa。系统的熔化斜率的变化被认为是与在室温下观察到的相变和增加这些金属的d-电子字符。当Mg、Ca和Sr从bcc结构中熔化时，它们显示出熔化曲线的平坦化（dT/dp类似于0），这很可能是由于蜂结构和熔体结构之间的体积变化很小。Sr在40 GPa和2000 K下具有熔化最小值，这与在室温下观察到的复杂结构的存在是一致的。在20（40）GPa以上，Ba（Sr）的熔化温度持续上升，这显然与sp →>d电子转移的完成有关。
The melting curves of Mg, Ca, Sr, and Ba were measured in a laser-heated diamond-anvil-cell to 80 GPa. Systematic changes in the melting slopes were found to be associated with the phase transitions observed at room temperature and with the increasing d-electron character of these metals. Mg, Ca, and Sr show a flattening of the melting curve (dT/dPsimilar to0) when they melt from the bcc structure, most likely due to the small volume change between bee and melt structures. Sr exhibits a melting minimum at 40 GPa and 2000 K which is coincident with the presence of complex structures observed at room temperature. Above 20 (40) GPa, Ba (Sr) shows a continuous rise in the melting temperature apparently related to the completion of the sp-->d electron transfer.