Phase transitions in europium at high pressures

Phase transitions in europium at high pressures
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高压下铕的相变

DOI:
10.1080/08957959.2013.775280
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发表时间:
2013
影响因子:
2
通讯作者:
Husband R
Husband R
中科院分区:
物理与天体物理4区
文献类型:
--
作者:
Husband R

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几十年来,高压下铕(Eu)金属的x射线衍射研究因菱形面体污染相hR6的存在而变得复杂,直到最近才认识到这一点。利用x射线粉末衍射,我们确定了hr6污染物在34.8(12)GPa下经历了向立方相cI12的相变。考虑到在相同压力下两个污染物相的每个Eu原子的体积,表明它们具有不同的化学计量或化学组成。我们还报道了在38和42 GPa之间纯Eu从不相应调制的Eu- iv相到Eu- v相的相变。
For several decades, x-ray diffraction studies on europium (Eu) metal at high pressure were complicated by the presence of a rhombo-hedral contaminant phase,hR6, which has been recognised as such only recently. Using x-ray powder diffraction, we have determined thehR6 contaminant to undergo a phase transition to a cubic phase,cI12, at 34.8(12) GPa. Consideration of the volume per Eu atom of the two contaminant phases at the same pressure suggests that they have different stoichiometries or chemical compositions. We also report a phase transition in pure Eu from the incommensurately-modulated Eu-IV phase to Eu-V between 38 and 42 GPa.
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