Programme

P.38 -- Posters, VCTP-50

Date: Tuesday, 5 August 2025

Time: 08:30 - 10:00

Effect of temperature and pressure on thermodynamic and melting properties of HP2 structure thallium metal

Nguyen Thi Hong (1)

(1) Hong Duc Unniversity, 565 Quang Trung, Dong Ve, Thanh Hoa, Vietnam.

In this work, we apply the Debye model to study the effects of temperature and pressure on some thermodynamic quantities of HP2-structured Thallium metal, in which the analytical expressions of the anharmonic effective potential, the effective force constant, the Debye frequency, the Debye temperature and the Debye-Waller factor are derived as functions of the axis ratio e = c/a and pressure. The pressure-dependent melting properties of Thallium are also studied by us based on the Lindemann melting model. The previously relevant experimental parameters are used by us to numerically calculate of these thermodynamic quantities up to a temperature of 700 K and a pressure of 50 GPa. Our findings indicate that the anharmonicity of the thermal lattice vibrations and pressure significantly affects the thermodynamic quantities of Thallium metal. Our calculated melting curve of Thallium agrees well with the theoretical and experimental results reported in previous studies. This study not only expands the understanding of the thermodynamic properties and melting behavior of Thallium metal, but can also be used to predict and calculate the thermodynamic properties, melting behavior of other metals and alloys in harsh environments

Presenter: Nguyen Thi Hong