Ionic mobility in Li x K1 − x Sn2F5 (x = 0–0.15) solid solutions obtained by mechanochemical synthesis

The solid solutions LixK1 − xSn2F5 (x = 0–0.15) were synthesized by the mechanochemical method. According to XRD and 19F MAS NMR data, the samples are isostructural to KSn2F5, which has superionic properties. The fluoride-ion jump frequency at a given temperature depends on the LiF concentration and...

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Bibliographic Details
Published in:Ionics 2019-01, Vol.25 (4), p.1481-1486
Main Authors: Slobodyuk, A B, Usoltseva, T I, Polyantsev, M M, Kavun, V Y
Format: Article
Language:English
Subjects:
Fluorine
Ionic mobility
Lithium
Lithium fluoride
Lithium ions
NMR spectroscopy
Occupancy
Solid solutions
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Summary:The solid solutions LixK1 − xSn2F5 (x = 0–0.15) were synthesized by the mechanochemical method. According to XRD and 19F MAS NMR data, the samples are isostructural to KSn2F5, which has superionic properties. The fluoride-ion jump frequency at a given temperature depends on the LiF concentration and is highest for x = 0.02. The amount of the mobile lithium ions at 420 K is maximal for Li0.075K0.925Sn2F5. Two types of fluorine positions with different jump frequencies are present in the structure of the compounds. Occupancy factors of the positions depend on the dopant concentration.
ISSN:0947-7047
1862-0760
DOI:10.1007/s11581-018-2645-9