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The thermally activated proton diffusion in BaZr0.9Y0.1O3-{\delta} wasstudied with electrochemical impedance spectroscopy (IS) and quasi-elasticneutron scattering (QENS) in the temperature range from 300 K to 900 K. Thediffusivities for the bulk material and the grain boundaries as obtained by ISobey an Arrhenius law with activation energies of 0.46 eV and 1.21 eV,respectively. The activation energies obtained by IS for the bulk are 0.26 eVabove 700 K and 0.46 eV, below 700 K. The total diffusivity as obtained by ISis by one order of magnitude lower than the microscopic diffusivity as obtainedby QENS. The activation energies obtained by QENS are 0.13 eV above 700 K and0.04 eV, below 700 K. At about 700 K, the diffusion constants for IS and QENShave a remarkable crossover, suggesting two processes with different activationenergies.

Proton diffusivity in the BaZr0.9Y0.1O3-{\delta} proton conductor