Gruneisen parameter of ionic and covalent crystals for low and high temperatures
The Gruneisen parameter for covalent crystals is calculated by employing an angular force model with eight parameters and using a 6-12 potential [Lennard-Jones potential (L-J)] whereas for ionic crystals, it is calculated by employing the Daniel's method, which uses anisotropy factor tables integral(s, t) of de Launay.
gruneisen parameter angular force model lennard-jones potential anisotropy thermal expansion