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Role of the doping level in localized proton motions in acceptor-doped barium zirconate proton conductors

DOI: 10.1039/C7CP07340B DOI Help

Authors: Daria Noferini (Chalmers University of Technology; Institut Laue-Langevin) , Michael M. Koza (Institut Laue-Langevin) , Seikh M. H. Rahman (Chalmers University of Technology) , Zach Evenson (Technische Universität München) , Gøran J. Nilsen (Institut Laue-Langevin; ISIS Facility) , Sten Eriksson (Chalmers University of Technology) , Andrew Wildes (Institut Laue-Langevin) , Maths Karlsson (Chalmers University of Technology)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Physical Chemistry Chemical Physics , VOL 44

State: Published (Approved)
Published: February 2018
Diamond Proposal Number(s): 19623

Abstract: Acceptor-doped barium zirconates are currently receiving considerable interest because of their high proton conductivity at intermediate temperatures, making them applicable as electrolytes in various electrochemical devices, but the mechanism of proton conduction is unclear. Here, we investigate the role of the acceptor-dopant level in the localized proton motions, i.e. proton transfers between oxygens and O–H reorientations, in hydrated samples of the proton conducting, acceptor-doped, perovskites BaZr1−xInxO3−x/2 with x = 0.10 and 0.20, using quasielastic neutron scattering (QENS). Analysis of the QENS spectra reveals that several proton transfer and O–H reorientational motions contribute to the QENS signal, as a consequence of the locally disordered nature of the structure due to the In doping of these materials, and establishes a generic and complex picture of localized proton dynamics in acceptor-doped barium zirconate based proton conductors. A comparison of the QENS results with vibrational spectroscopy data of the same materials, as reported in the literature, suggests a predominance of O–H reorientational motions in the observed dynamics. The highest doping level corresponds to a more distorted structure and faster dynamics, which thus indicates that some degree of structural disorder is favourable for high local proton mobility.

Subject Areas: Chemistry

Instruments: I11-High Resolution Powder Diffraction

Added On: 01/03/2018 17:18

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