Gravimetrie Interdiffusion Measurements in Molten Halides at Temperatures up to 1000 °C

Abstract

Abstract The interdiffusion coefficient of bromide ions at low concentration in molten silver chloride has been measured with the gravimetric technique, and it can be "least-squares" fitted into the equation D23 = 6.58 x 10-4 exp { - (4280 ± 110) / RT) (503-820 °C) where D23 is expressed in cm2 s-1 and RT in cal equiv-1 . Friction coefficients as defined by Klemm do not indicate association between the chloride and bromide ions. The interdiffusion coefficients of potassium ions in molten sodium chloride at 900 °C and of sodium ions in molten potassium chloride at 995 °C, both at low concentration, have been found to be approximately 2 x 10-4 cm2 s-1