Thermophysical Properties of a LiCaAlF sub 6 Melt.

Density, surface tension and viscosity were measured in a LiCaAlF sub 6 melt from 815degrees to 915C. At 815C (just above the melting temperature) the density, as measured by the Archimedean technique, is 2.505 g/cm sup 3 and the volume coefficient of thermal expansion is 2.90x10 sup (-4). The surface tension is 157.8 dyne/cm under a nitrogen atmosphere and 148.9 dyne/cm under argon according to the maximum bubble pressure method. The viscosity was measured with a Brookfield viscometer to be 19 cp at 815C and had an activation energy of 531 kJ/mole. These data will be used to model melt convection and flow for Bridgman and Czochralski growth of single crystals of this material.