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@ARTICLE{Rettenwander:850868,
author = {Rettenwander, Daniel and Redhammer, Günther J. and Guin,
Marie and Benisek, Artur and Krüger, Hannes and Guillon,
Olivier and Wilkening, Martin and Tietz, Frank and Fleig,
Jürgen},
title = {{A}rrhenius {B}ehavior of the {B}ulk {N}a-{I}on
{C}onductivity in {N}a 3 {S}c 2 ({PO} 4 ) 3 {S}ingle
{C}rystals {O}bserved by {M}icrocontact {I}mpedance
{S}pectroscopy},
journal = {Chemistry of materials},
volume = {30},
number = {5},
issn = {1520-5002},
address = {Washington, DC},
publisher = {American Chemical Society},
reportid = {FZJ-2018-04619},
pages = {1776 - 1781},
year = {2018},
abstract = {NASICON-based solid electrolytes with exceptionally high
Na-ion conductivities are considered to enable future all
solid-state Na-ion battery technologies. Despite 40 years of
research the interrelation between crystal structure and
Na-ion conduction is still controversially discussed and far
from being fully understood. In this study, microcontact
impedance spectroscopy combined with single crystal X-ray
diffraction, and differential scanning calorimetry is
applied to tackle the question how bulk Na-ion conductivity
σbulk of sub-mm-sized flux grown Na3Sc2(PO4)3 (NSP) single
crystals is influenced by supposed phase changes (α, β,
and γ phase) discussed in literature. Although we found a
smooth structural change at around 140 °C, which we assign
to the β → γ phase transition, our conductivity data
follow a single Arrhenius law from room temperature (RT) up
to 220 °C. Obviously, the structural change, being mainly
related to decreasing Na-ion ordering with increasing
temperature, does not cause any jumps in Na-ion conductivity
or any discontinuities in activation energies Ea. Bulk ion
dynamics in NSP have so far rarely been documented; here,
under ambient conditions, σbulk turned out to be as high as
3 × 10–4 S cm–1 at RT (Ea, bulk = 0.39 eV) when
directly measured with microcontacts for individual small
single crystals.},
cin = {IEK-1 / IEK-12},
ddc = {540},
cid = {I:(DE-Juel1)IEK-1-20101013 / I:(DE-Juel1)IEK-12-20141217},
pnm = {131 - Electrochemical Storage (POF3-131)},
pid = {G:(DE-HGF)POF3-131},
typ = {PUB:(DE-HGF)16},
pubmed = {pmid:29606799},
UT = {WOS:000427661500038},
doi = {10.1021/acs.chemmater.8b00179},
url = {https://juser.fz-juelich.de/record/850868},
}