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Molecular and Ionic Dynamics in NaxLi6–xC60

Authors :
Luca Maidich
Daniele Pontiroli
Pietro Carretta
Nicola Sarzi Amadè
Giacomo Magnani
Mattia Gaboardi
S. Sanna
Mauro Riccò
Sarzi Amadè, Nicola
Pontiroli, Daniele
Maidich, Luca
Riccò, Mauro
Gaboardi, Mattia
Magnani, Giacomo
Carretta, Pietro
Sanna, Samuele
Source :
The Journal of Physical Chemistry C
Publication Year :
2017
Publisher :
American Chemical Society (ACS), 2017.

Abstract

We report on the C-60, Na, and Li dynamics in NaxLi6xC60 fullerides (x = 0, 1, 5, and 6) in the temperature range 80-550 K by using C-13, Na-23, and Li-7 solid state NMR. The results show that the C-60 reorientation dynamics is hindered at room temperature for the Li-enriched fullerides, but it is active for the Na rich ones with a rate of the order of few kilohertz. Na-23 and Li-7 NMR measurements show the presence of two dominant thermally activated dynamics that can be associated with Li/Na ionic motions within the octahedral sites (intrasite motion) and between the octahedral and tetrahedral sites (intersite motion). The substitution of one Na or one Li ion in the end members Li6C60 and Na6C60, respectively, yields to an increase of the hopping rate of the intersite motion, which is necessary for the ionic diffusion in possible fulleride-based ionic conductors.

Details

ISSN :
19327455 and 19327447
Volume :
121
Database :
OpenAIRE
Journal :
The Journal of Physical Chemistry C
Accession number :
edsair.doi.dedup.....5c74f905d8425736f311bdf6a8e52cd3
Full Text :
https://doi.org/10.1021/acs.jpcc.7b00887