Abstract
AbstractUsing the self‐consistent phonon theory based on the thermodynamic double‐time Green's function method the dynamics of crystal lattice and the thermodynamics of the anharmonic cubic crystals in the vicinity of the instability point are investigated. The results of calculations for the instability temperature Ts, relative displacements of atoms, anharmonic contributions to the free energy, and free Gibbs energy as well as the isothermal elastic constants are given and compared with experimental and other theoretical data for potassium, sodium, and rubidium.
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