Abstract
Temperature dependences of thermal conduction coefficient X for the monocrystalline compounds of the Sn(Pb)2P2S(Se)6 system, their solid solutions and glass have been studied. A maximum in thermal conduction of Sn2P2S6 has been found at T = 11 K. Within the 12 K ≤ T ≤ UD interval (UD is a Debye temperature) λ varies in accordance with Eiken's law (λ ⊂ 1/T), while its absolute value is proportional to the dissociation energy of the crystal and inversely proportional to the total mass of the atoms in the unit cell. Low λ value and its weak dependence on the temperature at T > 2UD is probably due to that the free phonon path is proportional to the unit cell size.
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