Abstract
Nanosized La0.93Sc0.07F3 superionic conductor with tysonite structure was obtained at the gas–solution interface after interaction of aqueous salt solution with gaseous HF. NMR diffusion studies show that homovalent substitution of La3+ by Sc3+ with a smaller ionic radius leads to around four orders of magnitude faster fluorine diffusion as compared with crystalline LaF3 and faster as in all previously studied nanosized LaF3 and heterovalent-doped nanosized La0.95Sr0.05F2.95. The homovalent doping is a new route to improve the conductivity of tysonite-structured nanomaterials.
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Acknowledgements
The reported study was partially supported by a grant of the Russian Science Foundation, research project No 16-13-10223-P. The XRD research was carried out in the X-ray Diffraction Centre of SPbSU. The SEM study was carried out by the Nanotechnology Centre of SPbSU. The NMR experiments were accomplished in the Technical University Darmstadt.
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Gulina, L.B., Privalov, A.F., Weigler, M. et al. Anomalously High Fluorine Mobility in Tysonite-Like LaF3:ScF3 Nanocrystals: NMR Diffusion Data. Appl Magn Reson 51, 1691–1699 (2020). https://doi.org/10.1007/s00723-020-01247-5
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DOI: https://doi.org/10.1007/s00723-020-01247-5