Programme

P.66 -- Poster, VCTP-48

Date: Thursday, 3 August 2023

Time: 08:30 - 10:00

Thermodynamic properties of hcp structural metals under high pressure

Nguyen Thị Hong (1), Ho Khac Hieu (2), Tran Thi Hai (1), Nguyen Thi Dung (1)

(1) Hong Duc University, Thanh Hoa, Vietnam (2) Duy Tan University, Da Nang, Vietnam

In this work, the Debye model has been developed to study the pressure dependence of the extended X-ray absorption fine structure Debye–Waller factor, the Debye frequency and temperature of hexagonal close-packed (hcp) metals. The effects of the non-ideal axial ratio c/a of hcp structure on these thermodynamic quantities at high temperatures and pressures have also been considered. Additionally, based on the combination of the Debye model and the Lindemann melting law, we derive the analytic expression of melting temperature of hcp metals as a function of pressure. Numerical calculations have been performed for Mg (up to 50 GPa) and Zn metals (up to 70 GPa). Our results are compared with those of previous experimental and theoretical data showing a good agreement. This verification of our developed theory allows us to believe that the current model can be widely applied to consider the pressure effects on the thermodynamic quantities of other materials.

Presenter: Nguyen Thi Hong