Simulations show r > 1 for grain-boundary vs bulk cation diffusion activation enthalpies is possible in perovskites via dual mechanisms of isolated vacancies and neutral associates in space-charge layers.
Kielgas, a Roger A
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Faster grain-boundary diffusion with a higher activation enthalpy than bulk diffusion in ionic space-charge layers
Simulations show r > 1 for grain-boundary vs bulk cation diffusion activation enthalpies is possible in perovskites via dual mechanisms of isolated vacancies and neutral associates in space-charge layers.