Isotopic effect in thermodynamic properties of solid neon

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 20Ne and 22Ne 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. •Isotopic effects in thermodynamic properties of solid neon have been considered.•SMM allows us to study these effects including the anharmonicity of lattice vibrations.•Calculations are implemented for 20Ne and 22Ne isotopes in 0 K to 24.6 K.•SMM is an effective statistical approach to study isotope effects on thermodynamic properties.