Abstract
The kinetic model of proton exchange in LiNbO3, LiTaO3 crystals is proposed. The model is based on the formalism of relative composing units, which enables to find the expressions for gradients of chemical potentials of diffused particles in the sublattice of sites and intersites. The diffusion equations for hydrogen, lithium and vacancies have been obtained. Their solutions with some values of the self-diffusion coefficients enable for the first time to explain the step-like concentration profile of hydrogen, the upper limit of its concentration, the asymmetry of hydrogen and lithium depth-distributions and some other specific features of proton exchange process.
Published Version
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