Three natural type-IIa crystals were studied with regard to the forced diffusion of B in an electric field. The B diffusivity was found to be equal to 8.4 x 10-15 or 4 x 10-14cm2/s at 1000C, depending upon the direction of the electric field. The drift velocity of B in a field of 850V at 1000C was about 1.2 x 10-8cm/s.

T.Sung, G.Popovici, M.A.Prelas, R.G.Wilson, S.K.Loyalka: Journal of Materials Research, 1997, 12[5], 1169-71