The diffusivity of protons and deuterons is measured parallel to the hexagonal c‐axis in pure and Mg‐doped LiNbO3 crystals. The infrared absorption of OH− and OD− ions is monitored after isothermal annealing between 450 to 650°C in O2 bubbled through D2O. The activation energy for the out‐diffusion of protons and in‐diffusion of deuterons is found to be Ep ≈ (1.1 ± 0.2) eV and Ed ≈ (1 ± 0.1) eV, respectively. The proton out‐diffusion data are consistent with those obtained from electrical conductivity measurements.
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics