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Lattice mechanical properties of alkaline earth metals in bcc and fcc phases

机译:碱土金属在bcc和fcc相中的晶格力学性能

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摘要

A model pseudopotential depending on an effective core radius treated as a parameter is used for alkaline earth metals in bcc and fcc phases to study the Binding energy, Interatomic interactions, phonon dispersion curves, Phonon density of states, Debye-Waller factor, mean square displacement, Debye-Waller temperature parameters, dynamical elastic constants (C-11, C-12 and C-44), bulk modulus (B), shear modulus (C'), deviation from Cauchy relation (C-12-C-44), Poisson's ratio (sigma), Young's modulus (Y), behavior of phonon frequencies in the elastic limit independent of the direction (Y-1), limiting value in the [110] direction (Y-2), degree of elastic anisotropy (A) and propagation velocities of the elastic waves. The contribution of s-like electrons is incorporated through the second-order perturbation theory due to model potential. The theoretical results are compared with the existing experimental data. A good agreement between theoretical investigations and experimental findings has confirmed the ability of our potential to yield large numbers of lattice mechanical properties of certain alkaline earth metals.
机译:对于碱土金属在bcc和fcc相中使用的模型假位势取决于有效芯半径作为参数,以研究其结合能,原子间相互作用,声子弥散曲线,声子态密度,德拜-沃勒因子,均方位移,Debye-Waller温度参数,动态弹性常数(C-11,C-12和C-44),体积模量(B),剪切模量(C'),柯西关系偏差(C-12-C-44) ,泊松比(sigma),杨氏模量(Y),声子频率在独立于方向(Y-1)的弹性极限中的行为,在[110]方向(Y-2)的极限值,弹性各向异性程度( A)和弹性波的传播速度。由于模型势,通过二阶微扰理论结合了s类电子的贡献。将理论结果与现有的实验数据进行比较。理论研究和实验结果之间的良好一致性已证实我们具有产生某些碱土金属的大量晶格力学性能的潜力。

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