Advanced

Quasielastic neutron scattering of hydrated BaZr(0.90)A(0.10)O(2.95) (A = Y and Sc)

Karlsson, Maths LU ; Matic, Aleksandar; Engberg, Dennis; Bjorketun, Marten E.; Koza, Michael M.; Ahmed, Istaq; Wahnstroem, Goeran; Borjesson, Lars and Eriksson, Sten-G. (2009) In Solid State Ionics 180(1). p.22-28
Abstract
Proton motions in hydrated proton conducting perovskites BaZr(0.90)A(0.10)O(2.95) (A = Y and Sc) have been investigated using quasielastic neutron scattering. The results reveal a localized motion on the ps time scale and with an activation energy of similar to 10-30 meV, in both materials. The temperature dependence of the total mean square displacement of the protons shows an onset of this motion at a temperature of about 300 K. The low activation energy, much lower than the activation energy for the macroscopic proton conductivity, suggests that this motion is not the rate-limiting process for the long-range proton diffusion, i.e. it is not linked to the two materials significantly different proton conductivities. In fact, a comparison... (More)
Proton motions in hydrated proton conducting perovskites BaZr(0.90)A(0.10)O(2.95) (A = Y and Sc) have been investigated using quasielastic neutron scattering. The results reveal a localized motion on the ps time scale and with an activation energy of similar to 10-30 meV, in both materials. The temperature dependence of the total mean square displacement of the protons shows an onset of this motion at a temperature of about 300 K. The low activation energy, much lower than the activation energy for the macroscopic proton conductivity, suggests that this motion is not the rate-limiting process for the long-range proton diffusion, i.e. it is not linked to the two materials significantly different proton conductivities. In fact, a comparison of the QENS results with density functional theory calculations indicates that for both materials the observed motion may be ascribed to intra-octahedral proton transfers occurring close to a dopant atom. (C) 2008 Elsevier B.V. All rights reserved. (Less)
Please use this url to cite or link to this publication:
author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Proton conducting, Perovskite, Quasielastic neutron scattering
in
Solid State Ionics
volume
180
issue
1
pages
22 - 28
publisher
Elsevier
external identifiers
  • wos:000264538600005
  • scopus:58949095743
ISSN
0167-2738
DOI
10.1016/j.ssi.2008.11.004
language
English
LU publication?
yes
id
b324a48f-70ce-4af7-86e6-a11e6635eced (old id 1401319)
date added to LUP
2009-06-12 08:39:43
date last changed
2017-07-02 03:46:39
@article{b324a48f-70ce-4af7-86e6-a11e6635eced,
  abstract     = {Proton motions in hydrated proton conducting perovskites BaZr(0.90)A(0.10)O(2.95) (A = Y and Sc) have been investigated using quasielastic neutron scattering. The results reveal a localized motion on the ps time scale and with an activation energy of similar to 10-30 meV, in both materials. The temperature dependence of the total mean square displacement of the protons shows an onset of this motion at a temperature of about 300 K. The low activation energy, much lower than the activation energy for the macroscopic proton conductivity, suggests that this motion is not the rate-limiting process for the long-range proton diffusion, i.e. it is not linked to the two materials significantly different proton conductivities. In fact, a comparison of the QENS results with density functional theory calculations indicates that for both materials the observed motion may be ascribed to intra-octahedral proton transfers occurring close to a dopant atom. (C) 2008 Elsevier B.V. All rights reserved.},
  author       = {Karlsson, Maths and Matic, Aleksandar and Engberg, Dennis and Bjorketun, Marten E. and Koza, Michael M. and Ahmed, Istaq and Wahnstroem, Goeran and Borjesson, Lars and Eriksson, Sten-G.},
  issn         = {0167-2738},
  keyword      = {Proton conducting,Perovskite,Quasielastic neutron scattering},
  language     = {eng},
  number       = {1},
  pages        = {22--28},
  publisher    = {Elsevier},
  series       = {Solid State Ionics},
  title        = {Quasielastic neutron scattering of hydrated BaZr(0.90)A(0.10)O(2.95) (A = Y and Sc)},
  url          = {http://dx.doi.org/10.1016/j.ssi.2008.11.004},
  volume       = {180},
  year         = {2009},
}