The diffusion rates in doped and undoped crystals were measured by means of infra-red absorption. The minimum temperature for D+ diffusion was 1750K and the diffusivity was equal to about 10-6cm2/s at 1873K. The ratio of the H+/D+ diffusivities at 1873K was about 1.1.

R.Gonzalez, Y.Chen, K.L.Tsang: Physical Review B, 1982, 26[8], 4637-45