Thermal expansion of strontium fluoride

This paper deals with the thermal expansion of strontium fluoride (SrF2). The values of the coefficient of thermal expansion near about room temperature obtained by previous workers are collected in Table I. A measurement of the thermal expansion of SrF2 by the X-ray method seemed desirable. The results of such a study are reported here. Experimental details are given. The values of the lattice constants at different temperatures are given in Table II. These values have been fitted to a three term polynomial by a least squares treatment. From this the temperature variation of the expansion coefficient is obtained. The results are discussed. (U.K.)