Cation Transport Numbers in Molten AgNO3 ‐ AgCl Mixtures by Pressure‐EMF Measurements

Abstract

The pressure‐emf, or difference in electrode potential which results from a hydrostatic pressure difference, was measured in molten salt cells represented schematically as containing 0–42.8 m/o , from 200° to 260°C. Measurements of this effect, which depends on the difference between anion and cation mobilities, indicate that the cation transport number increases with increasing content or with decreasing temperature. Because of the small differences between anion mobilities, the pressure‐emf alone is shown to provide a good approximation to all three ion constituent transport numbers in this system.