Abstract
The incorporation and migration of protons in Y-doped BaCeO 3 crystals is studied, using room temperature infrared (IR) measurements and electrical conductivity measurements in the temperature range 25–250°C. The IR spectra of crystals pretreated at high temperature in H 2O-saturated gas show two very broad OH bands at 3383 cm −1 and 3035 cm −1. The OH bands are fully replaced by OD bands, at 2503 cm −1 and 2283 cm −1, upon treatment in D 2O-saturated gas. The conductivity of the H +-charged sample is two to three times that of the D + -charged sample in the temperature range studied, and the activation energy of the H + -charged sample (0.60 eV) is 0.05 eV lower, suggesting non-classical proton hopping.
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