First-Principles Calculations for Structural, Elastic, Electronic and Thermodynamic Properties of HfZn_{2} under Pressure

• Authors: Guo-Jun Li , Lan-Ting Shi , Cui-E Hu , Yan Cheng , Guang-Fu Ji
• Languages of publication: EN

Abstracts

EN

By using density functional theory within the Perdew-Burke-Ernzerhof generalized gradient approximation implemented in the VASP code, we study the structural, elastic, electronic, and thermodynamic properties of C15 Laves-phase compound HfZn_{2}. Comparing the lattice constants calculated from the Perdew-Burke-Ernzerhof generalized gradient approximation and local density approximation, we find that the former is in better agreement with the experimental data. The elastic constants of HfZn_{2} calculated by strain-stress method indicate that they keep stable up to 100 GPa. The bonding characteristics are discussed by analyzing the energy band structure, charge density distribution and charge density difference. Phonon dispersion curves and phonon density of states of HfZn_{2} at the different pressure are predicted for the first time. In addition, there is no imaginary frequency in the phonon band at different pressure, which also shows that HfZn_{2} is stable up to 100 GPa. Vibrational models are also illustrated based on phonon and group theory. The thermodynamic properties under high temperature and high pressure are calculated by different thermodynamic models. The heat capacity at constant pressure and low temperature calculated by quasi-harmonic approximation is more close to the measurement than that calculated by quasi-harmonic Debye models.

Keywords

EN

C15 Laves-phase; elastic properties; electronic structure; vibrational properties; quasi-harmonic approximation

• Publisher: Institute of Physics, Polish Academy of Sciences
• Journal: Acta Physica Polonica A
• Year: 2018
• Volume: 133
• Issue: 5
• Pages: 1299-1306

Dates

published

2018-05

received

2017-11-22

(unknown)

2018-02-28

Contributors

author

Guo-Jun Li

• College of Physical Science and Technology, Sichuan University, Chengdu 610065, China

author

Lan-Ting Shi

• College of Physical Science and Technology, Sichuan University, Chengdu 610065, China

author

Cui-E Hu

• College of Physics and Electronic Engineering, Chongqing Normal University, Chongqing 400047, China

author

Yan Cheng

• College of Physical Science and Technology, Sichuan University, Chengdu 610065, China

author

Guang-Fu Ji

• National Key Laboratory for Shock Wave and Detonation Physics Research, Institute of Fluid Physics, Chinese Academy of Engineering Physics, Mianyang 621900, China

Identifiers

DOI

10.12693/APhysPolA.133.1299