Abstract
A direct method is presented to determine the surface temperature at the interface of crystals and the liquid from which the crystals are formed by unidirectional cooling. This, so called, gradient method consists of determining the temperature-distance lines in the crystal layer, combined with the determination of the height of the crystal layer above the plate on which the layer is formed, for the same time of crystallization. Via the point of intersection of the straight line through the two measured points which are just in the crystal layer with the vertical through the height of the layer, an approximate surface temperature is first established. A correction is then applied for the fact that the actual temperature-distance lines are not straight. This correction is based on calculations for a model case without subcooling for which the surface temperature is known. This correction is applied for a practical case with subcooling. The method has been checked with paraxylene and gave good results. The method has been applied to salol and 1-2-4-trichlorobenzene. The results have been presented by means of the equation for the kinetics of crystallization.
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