Thermal conductivity of $\rm CaLa_2\rm S_4$ within the temperature range of $80$–$450$ K

The results of an experimental study of the thermal conductivity of the $\rm CaLa_2\rm S_4$ ceramics and that of material samples obtained by melt crystallization within the temperature range of $80$–$450$ K are presented. The approximating equations for the temperature dependences of their thermal conductivity coefficients are found. The heat transfer mechanisms in the studied materials are analyzed.