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A new technique has been developed for the determination of self-diffusion coefficients in molten salts. Two chemically identical columns of salt, one of which is radioactive, are allowed to diffuse into each other in a capillary. The diffusion is interrupted by means of freezing from the bottom. Equations are derived for the calculation of the disturbed concentration distribution, assuming that the contraction on freezing causes a Poiseuille flow in the melt above.

Self-diffusion Measurements in Molten Salts: A modified diffusion couple technique