Phase diagram analysis and crystal growth of solid solutions Ca1-xSrxF2

The binary phase diagram CaF2-SrF2 was investigated by differential thermal analysis (DTA). Both substances exhibit unlimited mutual solubility with an azeotropic point showing a minimum melting temperature of Tmin=1373∘C for the composition Ca0.582Sr0.418F2. Close to this composition, homogeneous single crystals up to 30 mm diameter without remarkable segregation could be grown by the Czochralski method.