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Dopant Concentration and Short-Range Structure Dependence of Diffusional Proton Dynamics in Hydrated BaInxZr1-xO3-x/2 (x=0.10 and 0.50)

Karlsson, Maths LU ; Fouquet, Peter; Ahmed, Istaq and Maccarini, Marco (2010) In Journal of Physical Chemistry C 114(7). p.3292-3296
Abstract
We investigate proton self-dynamics in the acceptor-doped and hydrated proton-conducting perovskite-type oxides BaInxZr1-xO3-x/2 (x = 0.10 and 0.50) on a microscopic length scale for temperatures in the range 470-525 K, using neutron spin-echo spectroscopy. For the highly doped material (x = 0.50), we observe a wide range of translational diffusional rates of the protons in the Structure, oil the nanosecond time scale and with in effective activation energy of about 0.75 eV. The wide distribution of diffusional rates is related to the In-doping, which creates local structural distortions or the average Cubic Structure and thus many structurally different Configurations of the protons, each with slightly different energy barriers for the... (More)
We investigate proton self-dynamics in the acceptor-doped and hydrated proton-conducting perovskite-type oxides BaInxZr1-xO3-x/2 (x = 0.10 and 0.50) on a microscopic length scale for temperatures in the range 470-525 K, using neutron spin-echo spectroscopy. For the highly doped material (x = 0.50), we observe a wide range of translational diffusional rates of the protons in the Structure, oil the nanosecond time scale and with in effective activation energy of about 0.75 eV. The wide distribution of diffusional rates is related to the In-doping, which creates local structural distortions or the average Cubic Structure and thus many structurally different Configurations of the protons, each with slightly different energy barriers for the protonic motion. For the weakly doped material (x = 0.10), which has a more ordered local Structure, the results show proton dynamics oil a Much more well-defined time scale, similar to 60 ps at 500 K, but also Suggest that a significant part of the protons ill the Structure are "immobile" within the experimental neutron spin-echo time window (similar to 5 ps to 1.3 ns). Furthermore, the results indicate that the dopant atoms affect the proton diffusion ill a nonlocalized manner and not as well-localized trapping centers. (Less)
Please use this url to cite or link to this publication:
author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Journal of Physical Chemistry C
volume
114
issue
7
pages
3292 - 3296
publisher
The American Chemical Society
external identifiers
  • wos:000274578700065
  • scopus:77649104541
ISSN
1932-7447
DOI
10.1021/jp910224s
language
English
LU publication?
yes
id
1253cac5-2e7d-45ca-a5ee-e81eb00838cb (old id 1568561)
date added to LUP
2010-03-17 14:38:52
date last changed
2018-05-29 09:36:34
@article{1253cac5-2e7d-45ca-a5ee-e81eb00838cb,
  abstract     = {We investigate proton self-dynamics in the acceptor-doped and hydrated proton-conducting perovskite-type oxides BaInxZr1-xO3-x/2 (x = 0.10 and 0.50) on a microscopic length scale for temperatures in the range 470-525 K, using neutron spin-echo spectroscopy. For the highly doped material (x = 0.50), we observe a wide range of translational diffusional rates of the protons in the Structure, oil the nanosecond time scale and with in effective activation energy of about 0.75 eV. The wide distribution of diffusional rates is related to the In-doping, which creates local structural distortions or the average Cubic Structure and thus many structurally different Configurations of the protons, each with slightly different energy barriers for the protonic motion. For the weakly doped material (x = 0.10), which has a more ordered local Structure, the results show proton dynamics oil a Much more well-defined time scale, similar to 60 ps at 500 K, but also Suggest that a significant part of the protons ill the Structure are "immobile" within the experimental neutron spin-echo time window (similar to 5 ps to 1.3 ns). Furthermore, the results indicate that the dopant atoms affect the proton diffusion ill a nonlocalized manner and not as well-localized trapping centers.},
  author       = {Karlsson, Maths and Fouquet, Peter and Ahmed, Istaq and Maccarini, Marco},
  issn         = {1932-7447},
  language     = {eng},
  number       = {7},
  pages        = {3292--3296},
  publisher    = {The American Chemical Society},
  series       = {Journal of Physical Chemistry C},
  title        = {Dopant Concentration and Short-Range Structure Dependence of Diffusional Proton Dynamics in Hydrated BaInxZr1-xO3-x/2 (x=0.10 and 0.50)},
  url          = {http://dx.doi.org/10.1021/jp910224s},
  volume       = {114},
  year         = {2010},
}