Investigations were made of the high-temperature diffusion, of Na and Mg ions into single crystals, by means of secondary-ion mass spectrometry. It was shown that the diffusion profiles were non-elementary in character, and that diffusion in the near-surface layer was slowed. In order to determine the bulk diffusion coefficient, the profiles had to be approximated for depths greater than 1μm. The efficiency of the procedure for determining diffusion coefficient was confirmed by comparing the present diffusion coefficients, for Na ions, with the values obtained by using other methods having high reliability and accuracy. The diffusion coefficients of Mg were determined for various initial chemical states.

Application of the Method of Secondary-Ion Mass Spectroscopy to the Study of Heterodiffusion in Alkali Halide Crystals. S.A.Gyngazov, A.P.Surzhikov, T.S.Frangulyan, A.V.Chernyavskii: Russian Physics Journal, 2002, 45[8], 753-8