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@ARTICLE{Lunghammer:857920,
author = {Lunghammer, S. and Prutsch, D. and Breuer, S. and
Rettenwander, D. and Hanzu, I. and Ma, Qianli and Tietz, F.
and Wilkening, H. M. R.},
title = {{F}ast {N}a ion transport triggered by rapid ion exchange
on local length scales},
journal = {Scientific reports},
volume = {8},
number = {1},
issn = {2045-2322},
address = {[London]},
publisher = {Macmillan Publishers Limited, part of Springer Nature},
reportid = {FZJ-2018-06874},
pages = {11970},
year = {2018},
abstract = {The realization of green and economically friendly energy
storage systems needs materials with outstanding properties.
Future batteries based on Na as an abundant element take
advantage of non-flammable ceramic electrolytes with very
high conductivities. Na3Zr2(SiO4)2PO4-type superionic
conductors are expected to pave the way for inherently safe
and sustainable all-solid-state batteries. So far, only
little information has been extracted from spectroscopic
measurements to clarify the origins of fast ionic hopping on
the atomic length scale. Here we combined broadband
conductivity spectroscopy and nuclear magnetic resonance
(NMR) relaxation to study Na ion dynamics from the µm to
the angstrom length scale. Spin-lattice relaxation NMR
revealed a very fast Na ion exchange process in
Na3.4Sc0.4Zr1.6(SiO4)2PO4 that is characterized by an
unprecedentedly high self-diffusion coefficient of 9 ×
10−12 m2s−1 at −10 °C. Thus, well below ambient
temperature the Na ions have access to elementary diffusion
processes with a mean residence time τNMR of only 2 ns.
The underlying asymmetric diffusion-induced NMR rate peak
and the corresponding conductivity isotherms measured in the
MHz range reveal correlated ionic motion. Obviously, local
but extremely rapid Na+ jumps, involving especially the
transition sites in Sc-NZSP, trigger long-range ion
transport and push ionic conductivity up to 2 mS/cm at room
temperature.},
cin = {IEK-12 / IEK-1},
ddc = {600},
cid = {I:(DE-Juel1)IEK-12-20141217 / I:(DE-Juel1)IEK-1-20101013},
pnm = {131 - Electrochemical Storage (POF3-131)},
pid = {G:(DE-HGF)POF3-131},
typ = {PUB:(DE-HGF)16},
pubmed = {pmid:30097645},
UT = {WOS:000441300700014},
doi = {10.1038/s41598-018-30478-7},
url = {https://juser.fz-juelich.de/record/857920},
}