Melting curve of potassium to 22 GPa
Melting curve of potassium to 22 GPa
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DOI：
10.1103/physrevb.84.054111
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发表时间：
2011-08
影响因子：
3.7
通讯作者：
O. Narygina;E. McBride;G. Stinton;M. McMahon
中科院分区：
文献类型：
--
作者：
O. Narygina;E. McBride;G. Stinton;M. McMahon
本文用原位X射线衍射和带外电阻加热的气膜金刚石对顶砧装置，测量了钾在22 GPa下的熔化曲线。熔化温度随压力的变化与钠的相似，但与以前报道的不同。在bcc相的稳定场中，在5.8（5）GPa处发现一个熔化最大值，随后熔化温度下降到fcc-主-客体（19）转变处的熔化最小值（19（1）GPa）。bcc-fcc-liquid和fcc-19-liquid三相点分别为466（10）K和13.6（3）GPa，390（10）K和19.0（3）GPa。
The melting curve of potassium has been measured experimentally to 22 GPa usingin situX-ray diffraction and gas-membrane diamond anvil cells equipped with external resistive heating. The evolution of the melting temperature with pressure is similar to that of sodium, but it is different to that reported previously. A melting maximum is found in the stability field of thebcc-phase, at 5.8(5) GPa, followed by a decrease in the melting temperature down to a melting minimum at thefcc-host-guest (19) transition at 19(1) GPa. Thebcc-fcc-liquid andfcc-19-liquid triple points are found to be at 466(10) K and 13.6(3) GPa and at 390(10) K and 19.0(3) GPa, respectively.