Thermal expansion of magnesium fluoride

Abstract

A precision determination of the lattice constants of magnesium fluoride, in the temperature range 30 to 640 °C., has been made, using a Unicam 19 cm. high-temperature powder camera and Cohen's analytical method. From these data, the coefficients of thermal expansion, art and a£ have been evaluated by a graphical method. Both the coefficients are found to show a parabolic variation with temperature.