Journal Article

FZJ-2017-04096

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Fast Na+ Ion Conduction in NASICON-Type Na3.4Sc2(SiO4)0.4(PO4 )2.6 Observed by 23Na NMR Relaxometry

Kaus, M. ; Guin, M.FZJ* ; Yavuz, M. ; Knapp, M. ; Tietz, F.FZJ* ; Guillon, O.FZJ* ; Ehrenberg, H. ; Indris, S. (Corresponding author)

2017
Soc. Washington, DC

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Please use a persistent id in citations: doi:10.1021/acs.jpcc.6b10523

Abstract: The bulk diffusion of Na in Na3.4Sc2(SiO4)0.4(PO4)2.6 was investigated by 23Na NMR relaxometry in the temperature range from 250 to 670 K. These measurements reveal fast Na diffusion with hopping rates of 3 × 108 s–1 for the Na+ ions at 350 K and activation barriers for single Na+ ion jumps of (0.20 ± 0.01) eV. From these values a diffusion coefficient of D = 6.4 × 10–12 m2/s and a Na ion conductivity of σNa = 4 mS/cm (both at 350 K) can be estimated. Measurements on two samples, one stored in air and one stored in Ar, do not show significant differences, which reveals that these NMR measurements are probing the bulk diffusion while conductivity measurements usually are also influenced by grain boundaries that can be affected by the moisture level during storage.

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Contributing Institute(s):

1. Helmholtz-Institut Münster Ionenleiter für Energiespeicher (IEK-12)
2. Werkstoffsynthese und Herstellungsverfahren (IEK-1)
3. JARA-ENERGY (JARA-ENERGY)

Research Program(s):

1. 131 - Electrochemical Storage (POF3-131) (POF3-131)

Appears in the scientific report 2017

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Database coverage:
; Current Contents - Physical, Chemical and Earth Sciences ; IF < 5 ; JCR ; SCOPUS ; Science Citation Index ; Science Citation Index Expanded ; Thomson Reuters Master Journal List ; Web of Science Core Collection

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