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arXiv 2105.04786cond-mat.mtrl-scicond-mat.supr-con
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基于DFT的全面深入了解四氢呋喃Mo5PB2的物理性质

A comprehensive DFT based insights into the physical properties of tetragonal Mo5PB2

M. I. Naher, M. A. Afzal, S. H. Naqib

摘要:

四钼五铅二化合物是一种新发现的超导体,属于具有重要技术意义的一类材料。令人惊讶的是,Mo5PB2的大量物理性质,包括弹性性质及其各向异性、声学行为、电子(电荷密度分布、电子密度差)、热物理、键合特性和光学性质,根本没有进行。在本工作中,我们首次采用基于密度泛函理论的第一性原理方法对这些性质进行了详细的研究。发现Mo5PB2是一种机械稳定、弹性各向异性的化合物,具有延展性。此外,通过计算电子态能量密度、电子密度分布、弹性性质和Mulliken键布居分析,对化学键进行了解释。Mo5PB2主要具有离子键、金属键和一些共价键特征。该化合物具有高水平的机械加工性。能带结构以及费米能级上的大电子态密度揭示了金属的特征。Mo5PB2的不同热参数的计算值与弹性性能密切相关。与能量有关的光学参数与电子能带结构密切相关。Mo5PB 2的光吸收和反射光谱以及较低的能量折射率表明该化合物有望在光电子器件领域得到应用。与弹性、机械性能和最小热导率的显著各向异性不同,光学参数相对于入射电场的偏振方向几乎是各向同性的。

英文摘要:

Tetragonal Mo5PB2 compound, a recently discovered superconductor, belongs to technologically important class of materials. It is quite surprising to note that a large number of physical properties of Mo5PB2, including elastic properties and their anisotropy, acoustic behavior, electronic (charge density distribution, electron density difference), thermo-physical, bonding characteristics, and optical properties have not been carried out at all. In the present work we have explored all these properties in details for the first time with density functional theory based first-principles method. Mo5PB2 is found to be a mechanically stable, elastically anisotropic compound with ductile character. Moreover, the chemical bonding is interpreted by calculating the electronic energy density of states, electron density distribution, elastic properties and Mulliken bond population analysis. Mo5PB2 has a combination of mainly ionic, metallic, and some covalent bonding characteristics. The compound possesses high level of machinability. The band structure along with a large electronic density of states at the Fermi level reveals metallic character. Calculated values of different thermal parameters of Mo5PB2 are closely related to the elastic properties. The energy dependent optical parameters show close assent to the underlying electronic band structure. The optical absorption and reflectivity spectra and the low energy index of refraction of Mo5PB2 show that the compound holds promise to be used in optoelectronic device sector. Unlike the notable anisotropy found in elastic, mechanical properties and minimum thermal conductivity, the optical parameters are found to be almost isotropic with respect to the polarization direction of the incident electric field.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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