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arXiv 1301.0744cond-mat.mtrl-sci
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稳定绝缘金属间化合物的预测

Prediction of stable insulating intermetallic compounds

M. Mihalkovic, M. Krajci, M. Widom

摘要:

我们探讨了结构的稳定性,表现出杂化间隙在广泛的二元和三元金属间化合物的能带结构和总能量计算。这项研究揭示了以前未知的金属基绝缘体,其中一些具有超过1 eV的大间隙,如Al2Fe和Al4IrRe。我们确认使用混合密度泛函,包括精确交换大的差距,并预测的差距为2.2 eV的铝锰硅在皮尔逊型TP6结构,这是一个化学有序的原型MoSi2(皮尔逊型tI6)结构的三元变体。

英文摘要:

We explore the stability of structure exhibiting hybridization gaps across a broad range of binary and ternary intermetallic compositions by means of band structure and total energy calculations. This search reveals previously unknown metal-based insulators, some with large gaps exceeding 1 eV, such as Al2Fe and Al4IrRe. We confirm large gaps using a hybrid density functional including exact exchange, and predict a gap of 2.2 eV for AlMnSi in the Pearson type tP6 structure, which is a chemically ordered ternary variant of the prototype MoSi2 (Pearson type tI6) structure.

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