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Volodymyr Smetana^1,2, Davide Grilli^2,3,4, Vitalii Shtender⁵

¹intelligent Advanced Materials, Department of Biological and Chemical Engineering and iNANO, Aarhus University, 8000 Aarhus C, Denmark.

Inorganic chemistry

|November 18, 2024

概括

研究人员在La-Ni-Si系统中发现了四种新的极性金属间化合物. 这些化合物表现出多样化的结构,包括类似钻石的框架和广泛的异原子结合,由类似的Ni和Si特性驱动.

科学领域:

固态化学固态化学
材料科学材料科学材料科学
晶体学晶体学是指结晶学.

背景情况:

拉尼-西三元系统以其复杂的金属间化合物形成而闻名.
了解这些系统中的结构属性关系对于材料设计至关重要.
之前的研究已经确定了各种阶段,但La-poor地区仍未得到充分探索.

研究的目的:

为了探索三元 La-Ni-Si 系统的 La-poor 区域.
发现和结构性地描述新的极性金属间化合物.
研究影响组合和结构多样性的因素.

主要方法:

通过弧技术合成金属间化合物.
单晶X射线衍射用于精确的结构确定.
分析结晶学数据以确定新阶段及其结构特征.

主要成果:

发现和描述了四种新的极性金属间化合物:LaNi5Si2,La2Ni8Si3,LaNi5Si3和La3Ni4Si2.
LaNi5Si2具有类似钻石的同原子Ni框架,类似于化物化合物.
La2Ni8Si3呈现同原子Ni4四面体和矩形; LaNi5Si3显示广泛的异原子键和同多面包装; La3Ni4Si2是同源系列的新成员.

结论:

在La-poor La-Ni-Si系统的勘探中,产生了显著的结构多样性.
(Ni) 和 (Si) 的相似原子半径和电子阴性是广泛观察到的化合物和晶体结构的关键驱动因素.
已识别的化合物扩展了这个系统中金属间相的已知结构景观.

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