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Proton diffusivity in the BaZr0.9Y0.1O3−δ proton conductor

Braun, Artur ; Duval, Sophie ; Ried, Peter ; Embs, Jan ; Juranyi, Fanni ; Strässle, Thierry ; Stimming, Ulrich ; Hempelmann, Rolf ; Holtappels, Peter ; Graule, Thomas

In: Journal of Applied Electrochemistry, 2009, vol. 39, no. 4, p. 471-475

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    Titre
    • Proton diffusivity in the BaZr0.9Y0.1O3−δ proton conductor
    Auteur
    • Braun, Artur. Laboratory for High Performance Ceramics, Empa - Swiss Federal Laboratories for Materials Testing and Research, 8600, Dübendorf, Switzerland
    • Duval, Sophie. Laboratory for High Performance Ceramics, Empa - Swiss Federal Laboratories for Materials Testing and Research, 8600, Dübendorf, Switzerland
    • Ried, Peter. Laboratory for High Performance Ceramics, Empa - Swiss Federal Laboratories for Materials Testing and Research, 8600, Dübendorf, Switzerland
    • Embs, Jan. Laboratory for Neutron Scattering, ETH Zurich and Paul Scherrer Institut, 5232, Villigen, Switzerland
    • Juranyi, Fanni. Laboratory for Neutron Scattering, ETH Zurich and Paul Scherrer Institut, 5232, Villigen, Switzerland
    • Strässle, Thierry. Laboratory for Neutron Scattering, ETH Zurich and Paul Scherrer Institut, 5232, Villigen, Switzerland
    • Stimming, Ulrich. Department of Physics E19, Technische Universität München, 85748, Garching, Germany
    • Hempelmann, Rolf. Physical Chemistry, Saarland University, 66041, Saarbrücken, Germany
    • Holtappels, Peter. Laboratory for High Performance Ceramics, Empa - Swiss Federal Laboratories for Materials Testing and Research, 8600, Dübendorf, Switzerland
    • Graule, Thomas. Laboratory for High Performance Ceramics, Empa - Swiss Federal Laboratories for Materials Testing and Research, 8600, Dübendorf, Switzerland
    Type de document
    • Postprint
    Langue
    • Anglais
    Publié dans
    • Journal of Applied Electrochemistry, 2009, vol. 39, no. 4, p. 471-475. Springer Netherlands
    Autre version électronique
    Identifiant OAI-PMH
    • oai:doc.rero.ch:320878
    Summary
    The thermally activated proton diffusion in BaZr0.9Y0.1O3−δ was studied with electrochemical impedance spectroscopy (IS) and quasi-elastic neutron scattering (QENS) in the temperature range 300-900K. The diffusivities for the bulk material and the grain boundaries as obtained by IS obey an Arrhenius law with activation energies of 0.46eV and 1.21eV, respectively. The activation energies obtained by IS for the bulk are 0.26eV above 700K and 0.46eV, below 700K. The total diffusivity as obtained by IS is by one order of magnitude lower than the microscopic diffusivity as obtained by QENS. The activation energies obtained by QENS are 0.13eV above 700K and 0.04eV, below 700K. At about 700K, the diffusion constants for IS and QENS have a remarkable crossover, suggesting two processes with different activation energies