Elastic and Force Constants of Body Centred Tetragonal Crystals for One-Two-Three Neighbours Non-Central Interactions

Abstract

Non central interactions consisting of central and angular forces, have been assumed among the first, second and third neighbours of a body centred tetragonal crystal. The secular determinant so obtained has been compared in the long wave length limit with the acoustic determinant and thus the six force constants have been related with the six elastic constants.