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Ab initio calculations and experimental determination of the structure of Cr_2AlC

机译:Cr_2AlC的结构从头算和实验确定

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We have calculated the equilibrium volume and the density of states (DOS) of Cr_2AlC for antiferromagnetic (AFM), ferromagnetic (FM) and paramagnetic (PM) configurations by ab initio total energy calculations. Based on a comparison of the cohesive energies as well as the DOS for all three magnetic configurations we have identified the FM configuration to be metastable. Furthermore, we report the structural characterization of polycrystalline Cr_2AlC thin films grown by magnetron sputtering. Our calculated interplanar distances and equilibrium volume for the PM and AFM configurations are in good agreement with our experiment. The charge density distribution suggests that the chemical bonding between Cr and C in Cr_2AlC is very similar to the one in cubic CrC.
机译:通过从头算总能量计算,我们已经计算了反铁磁(AFM),铁磁(FM)和顺磁(PM)配置的Cr_2AlC的平衡体积和态密度(DOS)。根据对所有三种磁性构型的内聚能和DOS的比较,我们确定FM构型是亚稳的。此外,我们报告了磁控溅射生长的多晶Cr_2AlC薄膜的结构表征。我们针对PM和AFM配置计算出的晶面距离和平衡体积与我们的实验非常吻合。电荷密度分布表明,Cr_2AlC中Cr和C之间的化学键与立方CrC中的化学键非常相似。

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