First-principles investigations on elastic, phonon and thermodynamic properties of SrB6 under pressure |
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| Authors: | Zhi-Guo LiChang-Ge Piao Xing PanYong-Kai Wei Yan Cheng Guang-Fu Ji |
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| Affiliation: | a Institute of Atomic and Molecular Physics, Sichuan University, Chengdu 610065, China
b Laboratory for Shock Wave and Detonation Physics Research, Institute of Fluid Physics, Chinese Academy of Engineering Physics, Mianyang 621900, China |
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| Abstract: | The elastic, phonon and thermodynamic properties of the divalent alkaline-earth hexaboride SrB6 are investigated by using plane-wave pseudopotential density functional theory method. The calculated structure parameters and bulk modulus are well consistent with the available experiment and theoretical data. The pressure dependences of elastic constants Cij, bulk modulus B0, shear modulus G, Young's modulus E and Poisson's ratio σ are also presented. With these elastic parameters, we investigate the mechanical stability and compressibility of SrB6. For the thermodynamic properties, both phonon and quasi-harmonic Debye model methods are adopted. Through the comparison with experimental and other theoretical results, we found the method of quasi-harmonic Debye model is a little better. Moreover, the phonon dispersion relations are also obtained. It is found that there are two LO/TO splitting around 5 THz and 26 THz, respectively. |
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| Keywords: | SrB6 Elastic properties Phonon Thermodynamics properties Density functional theory |
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