Quantitative experiments to investigate the effect of added impurity on the growth of sucrose crystals are described, l~ates of advance of growth steps were measured on crystals growing from pure solutions and from solutions to which raffinose was added. The temperature of the crystals was controlled at 30 °C. and the saturation ratio of the solutions was known. From the experimental results the diameter of the critical two dimensional nucleus at each saturation ratio was calculated and from this edge energy of a growth step.
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