Lattice dynamical study of NaCdAsS[sub 3]

Abstract

A short-range force constant model has been applied in investigating the Raman and the infrared modes in insulating NaCdAsS 3 in monoclinic phase having space group P21/n using normal coordinate analysis. Theoretical calculations on zone centre phonons have been made with 11 stretching and 9 bending force constants. The calculated Raman and infrared wave numbers are in good agreement with the available experimental results.