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@ARTICLE{An:824328,
author = {An, Tao and Baikie, Tom and Orera, Alodia and Piltz, Ross
O. and Meven, Martin and Slater, Peter R. and Wei, Jun and
Sanjuán, María L. and White, T. J.},
title = {{I}nterstitial {O}xide {I}on {D}istribution and {T}ransport
{M}echanism in {A}luminum-{D}oped {N}eodymium {S}ilicate
{A}patite {E}lectrolytes},
journal = {Journal of the American Chemical Society},
volume = {138},
number = {13},
issn = {1520-5126},
address = {Washington, DC},
publisher = {American Chemical Society},
reportid = {FZJ-2016-06937},
pages = {4468 - 4483},
year = {2016},
abstract = {Rare earth silicate apatites are one-dimensional channel
structures that show potential as electrolytes for solid
oxide fuel cells (SOFC) due to their high ionic conductivity
at intermediate temperatures (500–700 °C). This
advantageous property can be attributed to the presence of
both interstitial oxygen and cation vacancies, that create
diffusion paths which computational studies suggest are less
tortuous and have lower activation energies for migration
than in stoichiometric compounds. In this work, neutron
diffraction of Nd(28+x)/3AlxSi6–xO26 (0 ≤ x ≤ 1.5)
single crystals identified the locations of oxygen
interstitials, and allowed the deduction of a dual-path
conduction mechanism that is a natural extension of the
single-path sinusoidal channel trajectory arrived at through
computation. This discovery provides the most thorough
understanding of the O2– transport mechanism along the
channels to date, clarifies the mode of interchannel motion,
and presents a complete picture of O2– percolation through
apatite. Previously reported crystallographic and
conductivity measurements are re-examined in the light of
these new findings.},
cin = {JCNS (München) ; Jülich Centre for Neutron Science JCNS
(München) ; JCNS-FRM-II / JCNS-2},
ddc = {540},
cid = {I:(DE-Juel1)JCNS-FRM-II-20110218 /
I:(DE-Juel1)JCNS-2-20110106},
pnm = {6G4 - Jülich Centre for Neutron Research (JCNS) (POF3-623)
/ 6G15 - FRM II / MLZ (POF3-6G15)},
pid = {G:(DE-HGF)POF3-6G4 / G:(DE-HGF)POF3-6G15},
experiment = {EXP:(DE-MLZ)HEIDI-20140101},
typ = {PUB:(DE-HGF)16},
UT = {WOS:000373748000034},
pubmed = {pmid:27015162},
doi = {10.1021/jacs.5b13409},
url = {https://juser.fz-juelich.de/record/824328},
}