Europium-IV: an incommensurately modulated crystal structure in the lanthanides.
Europium-IV: an incommensurately modulated crystal structure in the lanthanides.
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铕-IV：镧系元素中的一种不通约调制的晶体结构。
DOI：
10.1103/physrevlett.109.095503
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发表时间：
2012
影响因子：
8.6
通讯作者：
Husband RJ
中科院分区：
文献类型：
--
作者：
Husband RJ
在高达50 GPa的高压下对金属铕进行了高分辨率X射线粉末衍射实验。与以前的报道不同，观察到Eu的hcp相不仅在18 GPa下稳定，而且在31.5 GPa下稳定。在31.5（5）GPa下，铕转变为具有超空间群的单斜晶系结构的（Eu-IV）相。观察到该新相是稳定的，其中观察到另一相变。Eu-IV是镧系元素中具有无公度晶体结构的第一相。
High-resolution x-ray powder-diffraction experiments were performed on europium metal at high pressure up to 50 GPa. At variance with previous reports, the hcp phase of Eu was observed to be stable not only to 18 GPa, but to 31.5 GPa. At 31.5(5) GPa, europium transforms to a phase (Eu-IV) with an incommensurately modulated monoclinic crystal structure with superspace group. This new phase was observed to be stable to, where another phase transition was observed. Eu-IV is the first phase in the lanthanide elements with an incommensurate crystal structure.