An NMR probe head for diffusion measurements in molten salts at temperatures up to 673 K is described. The spin echo technique using pulsed magnetic field gradients was employed. Resulting self-diffusion coefficients of Na+ in molten NaNO3 in the temperature range 596-670 K are compa­red with literature data obtained by other methods.

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The interdiffusion coefficient of silver ions ( D A ~+ )in molten NaN03, KN03, RbN03 and CsN03 has been measured at temperatures in the range 623-723 K and at pressures up to 1 kbar (1 bar = I2

Self-diffusion coefficients of 7 Li + ions have been measured in molten LiN0 3 with several compositions of 6 Li + and 7 Li + over a temperature range from 537 to 615 K. The NMR spin-echo method with pulsed field gradients was applied. It was found that the self-diffusion coefficient depends on the isotopic composition and shows a maximum at equimolar ratio. At temperatures above 600 K this behaviour disappears.

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