Diaphragm cell for high-temperature diffusion measurements. Tracer Diffusion coefficients for water to 363 K

Abstract

A modified diaphragm cell for diffusion measurements at high temperatures is described. It has been used to obtain tracer diffusion coefficients for ³HHO and H₂ ¹⁸O in water from 298 to 363 K. Where comparisons are available, the results are in good agreement with literature data. The data have been converted to self-diffusion coefficients of water and combined with existing data to provide a series of equations covering the temperature range 242–498 K.