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Crystal structures of lanthanum to 230 GPa
Physical Review B ( IF 3.2 ) Pub Date : 2024-07-16 , DOI: 10.1103/physrevb.110.024107
C. V. Storm 1 , C. R. Roy 1 , K. A. Munro , M. I. McMahon
Affiliation  

The structural behavior of lanthanum metal has been investigated up to 227 GPa using synchrotron x-ray diffraction. Rather than having the rhombohedral or orthorhombic structures previously reported to be stable above 80 GPa, we find that La adopts the tetragonal tI2 structure seen previously in Ce and Pr. We show that the recent claims of a rhombohedral structure arose from the misidentification of lanthanum hydride peaks. The revised pressure dependence of the atomic volume of La above 100 GPa further constrains the stoichiometry of the superconducting LaH10 superhydride, which is synthesized from La above 160 GPa.

中文翻译:


230 GPa 的镧晶体结构



使用同步加速器 X 射线衍射研究了高达 227 GPa 的镧金属的结构行为。我们发现La采用了先前在Ce和Pr中看到的四方 tI2 结构,而不是先前报道的在80 GPa以上稳定的菱形或斜方结构。我们表明,最近关于菱面体结构的主张源于对氢化镧峰的错误识别。修正后的 La 原子体积在 100 GPa 以上的压力依赖性进一步限制了超导 LaH10 超氢化物的化学计量,该超氢化物是由 La 在 160 GPa 以上合成的。
更新日期:2024-07-16
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