English
 
Help Privacy Policy Disclaimer
  Advanced SearchBrowse

Item

ITEM ACTIONSEXPORT

Released

Journal Article

Proton and apparent hydride ion conduction in Al-substituted SrTiO3

MPS-Authors
/persons/resource/persons280329

Münch,  W.
Department Physical Chemistry of Solids (Joachim Maier), Max Planck Institute for Solid State Research, Max Planck Society;

External Resource
No external resources are shared
Fulltext (restricted access)
There are currently no full texts shared for your IP range.
Fulltext (public)
There are no public fulltexts stored in PuRe
Supplementary Material (public)
There is no public supplementary material available
Citation

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.


Cite as: https://hdl.handle.net/21.11116/0000-000E-EE23-F
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.