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The role of oxygen ...
The role of oxygen vacancies on the vibrational motions of hydride ions in the oxyhydride of barium titanate
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- Eklöf-Österberg, Carin, 1987 (author)
- Chalmers tekniska högskola,Chalmers University of Technology
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- Mazzei, Laura, 1988 (author)
- Chalmers tekniska högskola,Chalmers University of Technology
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- Jedvik Granhed, Erik, 1979 (author)
- Chalmers tekniska högskola,Chalmers University of Technology
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- Wahnström, Göran, 1955 (author)
- Chalmers tekniska högskola,Chalmers University of Technology
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- Nedumkandathil, Reji (author)
- Stockholms universitet,Institutionen för material- och miljökemi (MMK),Stockholm University
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- Häussermann, Ulrich (author)
- Stockholms universitet,Institutionen för material- och miljökemi (MMK),Stockholm University
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- Jaworski, Aleksander (author)
- Stockholms universitet,Institutionen för material- och miljökemi (MMK),Stockholm University
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- Pell, Andrew J. (author)
- Stockholms universitet,Institutionen för material- och miljökemi (MMK),Stockholm University
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- Parker, Stewart F. (author)
- STFC Rutherford Appleton Laboratory
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- Jalarvo, Niina H. (author)
- Oak Ridge National Laboratory
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- Börjesson, Lars, 1957 (author)
- Chalmers tekniska högskola,Chalmers University of Technology
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- Karlsson, Maths, 1978 (author)
- Chalmers tekniska högskola,Chalmers University of Technology
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(creator_code:org_t)
- 2020
- 2020
- English.
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In: Journal of Materials Chemistry A. - : Royal Society of Chemistry (RSC). - 2050-7488 .- 2050-7496. ; 8:13, s. 6360-6371
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Abstract
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- Perovskite-type oxyhydrides, BaTiO3-xHx, represent a novel class of hydride ion conducting materials of interest for several electrochemical applications, but fundamental questions surrounding the defect chemistry and hydride ion transport mechanism remain unclear. Here we report results from powder X-ray diffraction, thermal gravimetric analysis, nuclear magnetic resonance spectroscopy, inelastic neutron scattering (INS), and density functional theory (DFT) simulations on three metal hydride reduced BaTiO3 samples characterized by the simultaneous presence of hydride ions and oxygen vacancies. The INS spectra are characterized by two predominating bands at around 114 (omega(perpendicular to)) and 128 (omega(parallel to)) meV, assigned as fundamental Ti-H vibrational modes perpendicular and parallel to the Ti-H-Ti bond direction, respectively, and four additional, weaker, bands at around 99 (omega(1)), 110 (omega(2)), 137 (omega(3)) and 145 (omega(4)) meV that originate from a range of different local structures associated with different configurations of the hydride ions and oxygen vacancies in the materials. Crucially, the combined analyses of INS and DFT data confirm the presence of both nearest and next-nearest neighbouring oxygen vacancies to the hydride ions. This supports previous findings from quasielastic neutron scattering experiments, that the hydride ion transport is governed by jump diffusion dynamics between neighbouring and next-nearest neighbouring hydride ion-oxygen vacancy local structures. Furthermore, the investigation of the momentum transfer dependence of the INS spectrum is used to derive the mean square displacement of the hydride ions, which is shown to be in excellent agreement with the calculations. Analysis of the mean square displacement confirms that the hydrogen vibrational motions are localized in nature and only very weakly affected by the dynamics of the surrounding perovskite structure. This insight motivates efforts to identify alternative host lattices that allow for a less localization of the hydride ions as a route to higher hydride ion conductivities.
Subject headings
- NATURVETENSKAP -- Kemi (hsv//swe)
- NATURAL SCIENCES -- Chemical Sciences (hsv//eng)
- NATURVETENSKAP -- Fysik -- Den kondenserade materiens fysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Condensed Matter Physics (hsv//eng)
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- ref (subject category)
- art (subject category)
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Eklöf-Österberg, ...
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Mazzei, Laura, 1 ...
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Jedvik Granhed, ...
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Wahnström, Göran ...
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Nedumkandathil, ...
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Häussermann, Ulr ...
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Jaworski, Aleksa ...
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Pell, Andrew J.
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Parker, Stewart ...
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Jalarvo, Niina H ...
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Börjesson, Lars, ...
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Karlsson, Maths, ...
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- About the subject
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- NATURAL SCIENCES
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NATURAL SCIENCES
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and Chemical Science ...
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- NATURAL SCIENCES
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NATURAL SCIENCES
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and Physical Science ...
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and Condensed Matter ...
- Articles in the publication
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Journal of Mater ...
- By the university
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Stockholm University
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Chalmers University of Technology