The thermal conductivity of (PbS)1-x(Sm2S3)x(x=0±0.04)

The temperature dependences (in 170±670 K interval) of λ thermal conductivity of (PbS)1-x(Sm2S3)x * (0-4 mol. percent Sm2S3) solid solutions are obtained. The isotherms of λ lattice thermal conductivity λ are constructed on the base of these data and the effective cross section of phonon scattering on Sm impurity atoms is estimated. The region of λ anomalous growth is revealed in the region of 1.25-2.0 mol. percent Sm2S3 concentrations not corresponding with usually observed decrease of λ at increase impurity concentration. It is supposed that anomalous growth of λ begins to take place when in the crystal the continuous chain of overlapping deformative fields formed by separate atom forms; the partial compensation of strengths in crystal lattice takes place and phonon dispersion decreases. The universal character of revealed effect is supposed