Depth profiles of the proton concentration in proton-exchanged samples were measured by means of secondary ion mass spectrometry. The concentration-dependent diffusion coefficient for proton-Li counter-diffusion was then determined by using the Boltzmann-Matano method. The results obeyed Arrhenius relationships, and their analysis yielded activation energies of 78.6, 66.5, and 82.4kJ/mol for X-cut, Y-cut and Z-cut specimens, respectively. The results also depended upon the Li content of the proton exchange source (which was present as the benzoate).

K.Ito, K.Kawamoto: Japanese Journal of Applied Physics - 1, 1997, 36[11], 6775-80