Influence of Morphology of LaF3 Nano-crystals on Fluorine Dynamics Studied by NMR Diffusometry
- Authors: Gulina L.B.1, Schikora M.2, Privalov A.F.2, Weigler M.2, Tolstoy V.P.1, Murin I.V.1, Vogel M.2
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Affiliations:
- Institute of Chemistry, Saint Petersburg State University
- Institut für Festkörperphysik, Technische Universität Darmstadt
- Issue: Vol 50, No 4 (2019)
- Pages: 579-588
- Section: Original Paper
- URL: https://journals.rcsi.science/0937-9347/article/view/248285
- DOI: https://doi.org/10.1007/s00723-018-1077-z
- ID: 248285
Cite item
Abstract
Ionic dynamics in nano-structured 2D superionic conductors LaF3 obtained by a synthesis at the gas–solution interface has been analyzed using 19F NMR Static Field Gradient (SFG) diffusometry in a temperature
range up to 800 K. The fluorine diffusion in 2D materials is significantly higher as compared to that in bulk LaF3 and is strongly dependent on the nano-crystalline sheet thickness. Its decrease from 18 nm to 6 nm leads to an increase of mobility by almost two orders of magnitude, resulting in an overall mobility enhancement of more than three orders of magnitude compared to mono-crystalline LaF3. Moreover, the activation energy is reduced from 1.2 eV for mono-crystals to 0.23 eV for 6 nm thin nano-crystalline powder samples.
About the authors
L. B. Gulina
Institute of Chemistry, Saint Petersburg State University
Author for correspondence.
Email: l.gulina@spbu.ru
ORCID iD: 0000-0002-1622-4311
Russian Federation, 7/9 Universitetskaya nab, St. Petersburg, 199034
M. Schikora
Institut für Festkörperphysik, Technische Universität Darmstadt
Email: alexei.privalov@physik.tu-darmstadt.de
Germany, Hochschulstraße 6, Darmstadt, 64289
A. F. Privalov
Institut für Festkörperphysik, Technische Universität Darmstadt
Author for correspondence.
Email: alexei.privalov@physik.tu-darmstadt.de
Germany, Hochschulstraße 6, Darmstadt, 64289
M. Weigler
Institut für Festkörperphysik, Technische Universität Darmstadt
Email: alexei.privalov@physik.tu-darmstadt.de
Germany, Hochschulstraße 6, Darmstadt, 64289
V. P. Tolstoy
Institute of Chemistry, Saint Petersburg State University
Email: alexei.privalov@physik.tu-darmstadt.de
ORCID iD: 0000-0003-3857-7238
Russian Federation, 7/9 Universitetskaya nab, St. Petersburg, 199034
I. V. Murin
Institute of Chemistry, Saint Petersburg State University
Email: alexei.privalov@physik.tu-darmstadt.de
ORCID iD: 0000-0003-1869-7590
Russian Federation, 7/9 Universitetskaya nab, St. Petersburg, 199034
M. Vogel
Institut für Festkörperphysik, Technische Universität Darmstadt
Email: alexei.privalov@physik.tu-darmstadt.de
Germany, Hochschulstraße 6, Darmstadt, 64289