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  Proton and apparent hydride ion conduction in Al-substituted SrTiO3

Widerøe, M., Münch, W., Larring, Y., & Norby, T. (2002). Proton and apparent hydride ion conduction in Al-substituted SrTiO3. Solid State Ionics, 154-155, 669-677.

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 Creators:
Widerøe, M., Author
Münch, W.1, Author           
Larring, Y., Author
Norby, T., Author
Affiliations:
1Department Physical Chemistry of Solids (Joachim Maier), Max Planck Institute for Solid State Research, Max Planck Society, ou_3370483              

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Free keywords: strontium titanate; proton conductivity; hydride ion conductivity; transport number; quantum molecular dynamics simulations; chemical compound; SrTiO3
 Abstract: Hydrogen ion conductivity in 2% and 10% Al-substituted SrTiO3
has been investigated by transport number measurements using
the concentration cell/emf method in wet atmospheres as a
function of pO(2) (10 (- 20) -1 atm) and temperature (350 -
1000 degreesC). Earlier indications of apparent negative charge
transport by hydrogen under reducing conditions and high
temperatures have been confirmed. By the present measurements,
possible artefacts from the type of acceptor-dopant, gas
buffer, electrode material, and porosity of the sample appear
to have been ruled out. Electrochemical pumping experiments
with gas chromatography were inconclusive with respect to
hydride ion transport. Thermogravimetry as a function of
hydrogen activity did not show evidence of hydride ion
incorporation, but indicated uptake of neutral hydrogen under
reducing conditions and high temperatures. Quantum molecular
dynamics simulations indicate the existence of defect species
or clusters that may be reminiscent of interstitial hydrogen
with a tendency to associate with effective negative charge,
e.g., on neighbouring titanium ions, under simulated reducing
conditions. (C) 2002 Elsevier Science B.V. All rights reserved.

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Language(s): eng - English
 Dates: 2002
 Publication Status: Issued
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: eDoc: 7060
ISI: 000179999700094
 Degree: -

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Title: Solid State Ionics
Source Genre: Journal
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Affiliations:
Publ. Info: -
Pages: - Volume / Issue: 154-155 Sequence Number: - Start / End Page: 669 - 677 Identifier: ISSN: 0167-2738