Optical measurements were used to determine the change of OH- concentration in KOH-doped single crystals after OH desorption treatment in an 0.33atmCl2 atmosphere. From the results, it was deduced that the diffusion of OH-, at temperatures ranging from 397 to 515C, could be described by:

D (cm2/s) = 3.0 x 105 exp[-1.95(eV)/kT]

Diffusion of Hydroxide Ion in Potassium Chloride Single Crystals. C.A.Allen, W.J.Fredericks: Journal of Solid State Chemistry, 1970, 1[2], 205-9