Using radioactive tracers, the transport numbers have 5 been measured for both the cation and anion in molten zinc chloride. Due to non-ideal conditions, there was a pronounced tendency for the experiments to give too low values for t+ and t-. This tendency became stronger as the current density increased in the cell. An extrapolation to zero current gives t+ = 0.6 + 0.1. There was no detectable temperature influence on the transport number in the region from 420°C to close to the boiling point, while measurements in the region below 420°C were uncertain due to the growth of dendrites of deposited zinc metal. No current transport by complex ions could be detected.
Lunden, Arnold, "Transport numbers in pure fused zinc chloride" (1960). Ames Laboratory Technical Reports. 17.