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首页> 外文期刊>Proceedings of the National Academy of Sciences of the United States of America >Structure of sodium above 100 GPa by single-crystal x-ray diffraction
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Structure of sodium above 100 GPa by single-crystal x-ray diffraction

机译:单晶X射线衍射分析100 GPa以上钠的结构

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At pressures above a megabar (100 GPa), sodium crystallizes in a number of complex crystal structures with unusually low melting temperatures, reaching as low as 300 K at 118 GPa. We have utilized this unique behavior at extreme pressures to grow a single crystal of sodium at 108 GPa, and have investigated the complex crystal structure at this pressure using high-intensity x-rays from the new Diamond synchrotron source, in combination with a pressure cell with wide angular apertures. We confirm that, at 108 GPa, sodium is isostructural with the c/16 phase of lithium, and we have refined the full crystal structure of this phase. The results demonstrate the extension of single-crystal structure refinement beyond 100 GPa and raise the prospect of successfully determining the structures of yet more complex phases reported in sodium and other elements at extreme pressures.
机译:在高于兆巴(100 GPa)的压力下,钠以许多复杂的晶体结构结晶,具有异常低的熔化温度,在118 GPa时低至300K。我们利用这种在极端压力下的独特行为,在108 GPa的压力下生长出钠的单晶,并使用来自新型Diamond同步加速器源的高强度X射线与压力盒相结合,研究了在此压力下的复杂晶体结构。具有宽角度孔。我们确认,在108 GPa时,钠与锂的c / 16相具有同构结构,并且我们已经精炼了该相的完整晶体结构。结果表明,单晶结构细化的扩展超过了100 GPa,并提高了成功确定钠和其他元素在极压下报道的更复杂相的结构的前景。

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