β -Technetium: An allotrope with a nonstandard volume-pressure relationship
β -Technetium: An allotrope with a nonstandard volume-pressure relationship
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β-锝：具有非标准体积-压力关系的同素异形体
DOI：
10.1103/physrevmaterials.5.063603
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发表时间：
2021
影响因子：
3.4
通讯作者：
Salamat, Ashkan
中科院分区：
文献类型：
--
作者：
Siska, Emily;Smith, Dean;Childs, Christian;Koury, Daniel;Forster, Paul M.;Lawler, Keith V.;Salamat, Ashkan
本文报道了锝的第二种同素异形体的合成和结构。在极端条件下使用激光加热的金刚石对顶砧单元获得了转化途径，并在原位同步辐射X射线衍射和拉曼中得到证实spectroscopy.is完全可恢复到环境条件，尽管与我们预测面心立方晶格的DFT计算相反，我们观察到随着压力的增加表现出进一步的四元畸变的四元结构。相对于hcp基态相，当用氮掺杂时具有意想不到的体积降低。这种反常的行为可能是一种元素中罕见的电子相变的标志.
We report the synthesis and structure of the second allotrope of technetium,. Transformative pathways are accessed at extreme conditions using the laser-heated diamond anvil cell and confirmed within situsynchrotron x-ray diffraction and Raman spectroscopy.is fully recoverable to ambient conditions, although counter to our DFT calculations predicting a face-centered-cubic lattice, we observe a tetragonal structurethat exhibits further tetragonal distortion with pressure.has an expanded volume relative to the hcp ground state phase, that when doped with nitrogen has an unexpected volume lowering. Such anomalous behavior is possibly indicative of a rare electronic phase transition in aelement.