Thermal Conductivity of Sr1 – xBaxF2 Single Crystals

The thermal conductivity κ of single crystals of the Sr1–xBaxF2 fluorite solid solution series has been measured in the temperature range 50–300 K by an absolute steady-state axial heat flow technique. The thermal conductivity has been shown to decrease with increasing temperature. Its composition dependences have a minimum at intermediate compositions. The congruently melting composition Sr0.34Ba0.66F2, corresponding to the minimum in liquidus curves, has κ = 15.2 W/(m K) at 50 K and 2.95 W/(m K) at 300 K.