Programme

P.27 -- Poster, VCTP-48

Date: Tuesday, 1 August 2023

Time: 08:30 - 10:00

Investigation of isotopic effects in thermodynamic properties of solid neon

Ho Khac Hieu (1,2), Nguyen Phuoc The (1,2), Huynh Ngoc Toan (1,2), Dang Thanh Hai (3), and Vu Van Hung (4)

1) Institute of Research and Development, Duy Tan University, 03 Quang Trung, Hai Chau, Da Nang 550000, Viet Nam 2) Faculty of Environmental and Natural Sciences, Duy Tan University, 03 Quang Trung, Hai Chau, Da Nang 550000, Viet Nam 3) Vietnam Education Publishing House, 81 Tran Hung Dao, Hoan Kiem, Hanoi, Viet Nam 4) VNU University of Education, 144 Xuan Thuy, Cau Giay, Hanoi 123105, Viet Nam

Isotopic effects in mean-square displacement, specific heat at constant pressure and linear thermal expansion coefficient of solid neon have been considered using the statistical moment method in statistical mechanics. This approach allows us to study these effects including the anharmonicity of lattice vibrations. We implement calculations for $^{20}$Ne and $^{22}$Ne isotopes in temperature range from 0~K to the melting temperature (24.6~K) using Lennard-Jones potential to describe the interaction between Ne quantum particles. Our numerical results are compared with those of path-integral Monte Carlo simulations and previous experimental data showing the good agreement. This research presents an effective statistical approach to study isotope effects on thermodynamic quantities of materials.

Presenter: Ho Khac Hieu