Thermodynamical and phonon properties of rare-earth REBi (REÂ =Â Ce and La) bismuthidies

► Well agreement between the calculated structural parameters and ΘD with theoretical ones. ► PDC, positive in the rocksalt phase of CeBi and LaBi, show dynamically stable phase. ► Sound velocities and Debye temperature are obtained successfully. ► The variation of Cv with temperature obeys the Dulong-Petit's law at high temperature. ► At low temperature lattice-specific heat obeys the Debye's T3 law.