Effect of temperature on non-destructive wave propagation in potassium halides

Temperature dependence of ultrasonic attenuation is investigated for potassium halides in the temperature range 100–400 K. These calculations are done for KCl, KBr and KI for longitudinal and shear waves along the 〈1 1 1〉 direction. The non-linearity coupling parameters and thermal relaxation time have also been obtained for these crystals. In the present investigation, it has been found that phonon–phonon interaction is the dominant cause for ultrasonic attenuation.     

Higher approximations for transition matrices and their application to the calculation of atomic spectra

Theoretical and Experimental Chemistry -     

Thermal diffusivity and thermal conductivity studies on the zirconate,cerate and uranate of barium

The thermal diffusivity and thermal conductivity of the zirconate, cerate and uranate of barium were investigated by employing the laser flash technique. The variation in the thermal resistivity as a function of temperature was examined and the heat transport behaviour of these materials is discussed.