Research Paper
STUDY OF LATTICE DYNAMICS OF DIAMOND
Author: S.R.B.THAPA*, ,
*Department of Physics, Birendra Multiple Campus Bharatpur (Chitwan) Nepal. e-Mail: thapasrb@gmail.com
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Abstract
A phenomenological model is used to study the lattice dynamics of diamond. Phonon frequencies, Debye Characteristic temperature and microscopic elastic constants are studied using Urey Bradley Valence Force Field (UVVF) approximations. The potential of the crystal involves (i) the central force due to bond-stretching (ii) the angular force due to bond bending (iii) central force between non-bonded atoms (iv) the force due to interaction of one internal co-ordinate to adjacent internal co-ordinate .Calculated results of phonon dispersion curves, Debye Characteristic temperatures and microscopic elastic constants are compared with experimental results giving fairly good agreement.
