Premium
A simple phenomenological model for the lattice dynamics of B. C. C. metals
Author(s) -
Raiand R. C.,
Hemkar M. P.
Publication year - 1977
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.2220790130
Subject(s) - rubidium , alkali metal , ionic bonding , phenomenological model , ion , electron , lattice (music) , chemistry , debye , phonon , condensed matter physics , thermodynamics , physics , potassium , quantum mechanics , organic chemistry , acoustics
A simple phenomenological model is developed for b.c.c. metals which considers ion‐ion interaction up to second neighbours and electron‐ion interaction on the lines of Bhatia theory using an appropriate value for the screening parameter. The volume force is averaged over the whole Wigner‐Seitz sphere. In the present model the ionic lattice is in equilibrium in a medium of electrons. The theory is satisfactorily applied to the computation of phonon dispersion curves and Debye characteristic temperatures for four alkali metals, lithium, sodium, potassium, and rubidium.