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The temperature dependence of the ultrasound wave absorption in bulk$p$-Cd$_{0.2}$Hg$_{0.8}$Te crystals free from low-angle grain boundaries hasbeen studied experimentally for the first time in the frequency range 10--55MHz and the temperature interval 150--300 K, and the corresponding results ofmeasurements are presented. The maximum value of absorption coefficient isfound to increase and to shift toward higher temperatures, as the ultrasoundfrequency grows. The results obtained can be satisfactorily explained in theframework of the Brailsford model, which associates the ultrasound absorptionwith vibrations of thermally activated dislocation kinks. The characteristicparameters of this model for $p$-Cd$_{0.2}$Hg$_{0.8}$Te are determined; namely,the frequency coefficient $f_{k}\approx $~6\,$\times $\,10$^{\,9}$\,Hz and thekink diffusion activation energy $W_{k}\approx $~0.11\,eV. The dislocationconcentration is also evaluated ($\alpha \approx$~2\,$\times$\,10$^{10}$\,m$^{-2}$), with the determined value being consistentwith that obtained by the selective etching method (0.7\,$\times$\,10$^{10}$\,m$^{-2}$).

Features of ultrasound absorption by dislocations in subgrain-free cd\boldmath$_{0.2} $hg$_{0.8}$te crystals