A great deal of work has been devoted in the last decades to the study of the modeling of ion exchange in glass, in order to tailor the physical properties of the modified surface, e.g. refractive index or stress profiles. The first models were based on simple ionic diffusion equations, while in the last years it became clear that the glass local structure changes during the ion exchange even at temperatures lower than the glass transition one. In fact, structural analyses underlined the local rearrangement of the ion neighbors as a function of the dopant concentration. This makes the analysis of the ion exchange process quite complex, with a corresponding difficulty in predicting and describing the physical properties of the treated surfaces. The aim of this work is to briefly review the main approaches simulating the ion exchange process in silicate glasses, and to suggest a further phenomenological approach, already used for the study of mixed-alkali glasses, which relates the transport parameters to the micro-structural properties of the glass network, in a simple but effective way. The ion exchange mechanism for different ionic species will be analyzed, taking also into account the different charge states of the migrating ions. The phenomenological coefficients will be connected to the microstructural information obtained for similar systems by different analysis techniques. Moreover, correlation effects between the ionic fluxes will be evidenced when different ionic species participate in the ion exchange process.

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