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First-principles studies of Tin+1SiNn (n = 1, 2, 3) MAX phase
Philosophical Magazine ( IF 1.5 ) Pub Date : 2020-05-12 , DOI: 10.1080/14786435.2020.1759835
Gokhan Surucu 1, 2 , Hasan Huseyin Gullu 3 , Abdullah Candan 4 , Bugra Yildiz 5 , Aytac Erkisi 6
Affiliation  

ABSTRACT In this study, the structural, electronic, mechanical, lattice dynamical and thermodynamic characteristics of ( 1, 2 and 3) phase compounds were investigated using the first principle calculations. These ternary nitride compounds were found to be stable and synthesisable, and the results on the stability nature of them were also evaluated for the possible and phases. - was found to be the most stable one among these new class of layered phases for which limited works are available in the literature. The band structures, that are essential for the electronic properties, were determined along with the partial density of states (PDOS) indicating the metallic behaviour of these compounds. The polycrystalline elastic moduli were calculated based on the single-crystal elastic constants and the mechanical stabilities were verified. Some basic physical parameters, such as bulk modulus, shear modulus, Young’s modulus, Poisson’s ratio, Debye temperature, and sound velocities, were also predicted. Furthermore, the anisotropic elastic properties were visualised in three dimensions (3D) for Young’s modulus, linear compressibility, shear modulus and Poisson’s ratio as well as with the calculation of the anisotropic factors. - phase showed the most isotropic characteristics with minimum deviations. These theoretical values were also used to identify the stiffness and ionic characteristics. The phonon dispersion curves and corresponding PDOS indicated that compounds were dynamically stable. Moreover, thermodynamic properties obtained from phonon dispersion curves were investigated in detail.

中文翻译:

Tin+1SiNn (n = 1, 2, 3) MAX 相的第一性原理研究

摘要 在这项研究中,使用第一性原理计算研究了(1、2 和 3)相化合物的结构、电子、机械、晶格动力学和热力学特性。发现这些三元氮化物化合物是稳定和可合成的,并且还对它们的可能和相的稳定性性质的结果进行了评估。- 被发现是这些新的分层相中最稳定的一种,在文献中可以找到有限的工作。对电子特性至关重要的能带结构与表明这些化合物的金属行为的部分态密度 (PDOS) 一起确定。基于单晶弹性常数计算多晶弹性模量并验证机械稳定性。还预测了一些基本物理参数,例如体积模量、剪切模量、杨氏模量、泊松比、德拜温度和声速。此外,各向异性弹性特性在三个维度 (3D) 中可视化,包括杨氏模量、线性压缩率、剪切模量和泊松比,以及各向异性因子的计算。- 相位显示出最大的各向同性特性,偏差最小。这些理论值还用于确定刚度和离子特性。声子色散曲线和相应的 PDOS 表明化合物是动态稳定的。此外,详细研究了从声子色散曲线获得的热力学性质。还预测了德拜温度和声速。此外,各向异性弹性特性在三个维度 (3D) 中可视化,包括杨氏模量、线性压缩率、剪切模量和泊松比,以及各向异性因子的计算。- 相位显示出最大的各向同性特性,偏差最小。这些理论值还用于确定刚度和离子特性。声子色散曲线和相应的 PDOS 表明化合物是动态稳定的。此外,详细研究了从声子色散曲线获得的热力学性质。还预测了德拜温度和声速。此外,各向异性弹性特性在三个维度 (3D) 中可视化,包括杨氏模量、线性压缩率、剪切模量和泊松比,以及各向异性因子的计算。- 相位显示出最大的各向同性特征,偏差最小。这些理论值还用于确定刚度和离子特性。声子色散曲线和相应的 PDOS 表明化合物是动态稳定的。此外,详细研究了从声子色散曲线获得的热力学性质。剪切模量和泊松比以及各向异性因子的计算。- 相位显示出最大的各向同性特性,偏差最小。这些理论值还用于确定刚度和离子特性。声子色散曲线和相应的 PDOS 表明化合物是动态稳定的。此外,详细研究了从声子色散曲线获得的热力学性质。剪切模量和泊松比以及各向异性因子的计算。- 相位显示出最大的各向同性特性,偏差最小。这些理论值还用于确定刚度和离子特性。声子色散曲线和相应的 PDOS 表明化合物是动态稳定的。此外,详细研究了从声子色散曲线获得的热力学性质。
更新日期:2020-05-12
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