A gravimetric method has been used to study interdiffusion in binary mixtures of AgNO3 and KNO3 over the range 50 -75 mole % AgNO3 at tem peratures below 200°C. The obtained cation diffusion coefficients are of the order of 2 × 10-6 cm2 sec-1 i.e. considerably lower than what might have been expected from other diffusion m easurements. It has previously been found that there is a tendency for self-diffusion coefficients obtained with fritted discs to be lower than those obtained with the conventional open-end capillary technique. Some possible sources of error are discussed.
Notizen: On the Validity of Inter- and Self-Diffusion Measurements in Molten Salts by Methods Applying Multiporous Fritted Discs