The temperature-dependent acoustical dissipation due to phonon-phonon (p-p) interaction, thermo-elastic mechanism and dislocation damping due to screw and edge dislocations were evaluated in MnO and CoO in the fcc (NaCl-B1 type) phase, at 50 to 500K for longitudinal and shear modes of propagation along 3 crystallographic directions: <100>, <110> and <111>. Electrostatic and Born repulsive potentials were used to obtain second-order and third-order elastic constants, taking interactions up to next nearest neighbours. The second-order and third-order elastic constants obtained at various temperatures were used to obtain Gruneisen parameters and non-linearity or anisotropic parameters.

Acoustical Dissipation Due to Phonon-Phonon Interaction, Thermoelastic Loss and Dislocation Damping in MnO and CoO (A). R.P.Singh, M.P.Singh, R.K.Singh: The Journal of the Acoustical Society of America, 2008, 123[5], 3454