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Title: Synthesis of LaF{sub 3} nanosheets with high fluorine mobility investigated by NMR relaxometry and diffusometry

Ionically conducting lanthanum fluoride (LaF{sub 3}), displaying a nanoscopic lamellar structure, has been synthesized at the surface of an aqueous solution of LaCl{sub 3} and HF. The structure and the chemical composition of the conductor have been analyzed by SEM, electron probe microanalysis, X-ray powder diffraction, FTIR, and {sup 19}F magic angle spinning nuclear magnetic resonance (NMR) spectroscopy. The fluorine dynamics have been studied by NMR diffusometry and relaxometry in a temperature range from room temperature up to 875 K. The fluorine self-diffusion coefficient of the nanostructured LaF{sub 3} is about two orders of magnitude larger than that of bulk LaF{sub 3}. This novel material is highly promising for many typical applications of fluorine ionic systems.
Authors:
; ;  [1] ; ;  [2]
  1. Institute of Chemistry of St. Petersburg State University 198504, Universitetsky pr., 26 Peterhof, St. Petersburg (Russian Federation)
  2. Institut für Festkörperphysik, Technische Universität Darmstadt, Hochschulstr. 6, 64289 Darmstadt (Germany)
Publication Date:
OSTI Identifier:
22493352
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Chemical Physics; Journal Volume: 143; Journal Issue: 23; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; ABSORPTION SPECTROSCOPY; AQUEOUS SOLUTIONS; CHEMICAL COMPOSITION; ELECTRON MICROPROBE ANALYSIS; FLUORINE; FLUORINE 19; FOURIER TRANSFORMATION; HYDROFLUORIC ACID; INFRARED SPECTRA; LANTHANUM CHLORIDES; LANTHANUM FLUORIDES; MOBILITY; NANOSTRUCTURES; NMR SPECTRA; NUCLEAR MAGNETIC RESONANCE; SCANNING ELECTRON MICROSCOPY; SELF-DIFFUSION; SYNTHESIS; TEMPERATURE RANGE 0273-0400 K; X-RAY DIFFRACTION