First-Principles Calculations of Elastic Properties of LaNi4.75Sn0.25 Alloys under Pressure
XIONG Bao-Ku1, GONG Ke1, ZHOU Jing-Jing2, YU Ben-Hai1, CHEN Dong1, SHI De-Heng1
1College of Physics and Electronic Engineering, Xinyang Normal University, Xinyang 4640002Institute of Atomic and Molecular Physics, Sichuan University, Chengdu 610065
First-Principles Calculations of Elastic Properties of LaNi4.75Sn0.25 Alloys under Pressure
XIONG Bao-Ku1, GONG Ke1, ZHOU Jing-Jing2, YU Ben-Hai1, CHEN Dong1, SHI De-Heng1
1College of Physics and Electronic Engineering, Xinyang Normal University, Xinyang 4640002Institute of Atomic and Molecular Physics, Sichuan University, Chengdu 610065
摘要The equilibrium lattice constants, bulk modulus, shear modulus, elastic constants and Debye temperature of LaNi4.75Sn0.25 under pressure are calculated using the full-potential linearized augmented plane wave (FP-LAPW) method as well as the quasi-harmonic Debye model. The results at zero pressure are in excellent agreement with the experimental data. The Sn atom is found to occupy the equivalent 3g site (0.5a, 0.75b, 0.5c) in the quadruple cell. The Debye temperature of LaNi4.75Sn0.25 is lower than that of LaNi5. The dependences of bulk modulus on finite temperature and on finite pressure are also investigated. The results show that the bulk modulus B increases monotonously as pressure increases.
Abstract：The equilibrium lattice constants, bulk modulus, shear modulus, elastic constants and Debye temperature of LaNi4.75Sn0.25 under pressure are calculated using the full-potential linearized augmented plane wave (FP-LAPW) method as well as the quasi-harmonic Debye model. The results at zero pressure are in excellent agreement with the experimental data. The Sn atom is found to occupy the equivalent 3g site (0.5a, 0.75b, 0.5c) in the quadruple cell. The Debye temperature of LaNi4.75Sn0.25 is lower than that of LaNi5. The dependences of bulk modulus on finite temperature and on finite pressure are also investigated. The results show that the bulk modulus B increases monotonously as pressure increases.
2008, Vol. 25 
