Abstract
Based on infrared spectra and protonic conductivity measurements, we propose a model of hydrogen ion migration in K1−yLiyTa1−xNbxO3 doped crystals and use it to obtain a theoretical estimate of the diffusion constant pre-exponential factor D0 that is in reasonable agreement with the experimental result. This model shows that the transition energy of the second, and higher, overtone(s) of the [OH] vibration can be higher than the activation energy of hydrogen ion migration.
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