“…To develop optical materials, single crystals, and ceramics based on heterovalent solid solutions of inor ganic fluorides for creation of effective solid state lasers, including diode pumped ones [1,2], it is nec essary to know such an important characteristic of grown crystals as thermal conductivity. It was estab lished previously that heterovalent cation substitutions in the CaF 2 fluorite structure lead to a significant decrease in thermal conductivity [3,4].…”