Diffusion in amorphous LiNbO3 studied by 7Li NMR — comparison with the nano- and microcrystalline material

Martin Wilkening; Detlef Bork; Sylvio Indris; Paul Heitjans

doi:10.1039/B201193J

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Diffusion in amorphous LiNbO₃ studied by ⁷Li NMR — comparison with the nano- and microcrystalline material†

Martin Wilkening,^a Detlef Bork,^b Sylvio Indris^a and Paul Heitjans^a

Author affiliations

^a Institut für Physikalische Chemie und Elektrochemie, Universität Hannover, Callinstraße 3-3a, Hannover, Germany
E-mail: heitjans@mbox.pci.uni-hannover.de

^b Institut für Physikalische Chemie II, Universität Karlsruhe, Kaiserstraße 12, Karlsruhe, Germany

Abstract

Lithium diffusion in amorphous LiNbO₃, synthesized by a sol–gel process, was investigated by temperature- and frequency-dependent ⁷Li NMR experiments. ⁷Li spin-lattice relaxation rates T⁻¹₁ and ⁷Li nuclear magnetic resonance spectra, in particular line shapes and motional narrowing of the central line, were measured. The results are discussed in comparison with those on nano- and microcrystalline LiNbO₃ investigated by us earlier. The Li diffusivity in the amorphous material is much higher than in the microcrystalline one and can be described by practically the same diffusion parameters as in nanocrystalline LiNbO₃. This suggests that the diffusion pathways in amorphous LiNbO₃ and in the interfacial regions of nanocrystalline LiNbO₃ have similar structures.

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Article information

DOI: https://doi.org/10.1039/B201193J
Article type: Paper
Submitted: 01 Feb 2002
Accepted: 28 Mar 2002
First published: 08 May 2002

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Phys. Chem. Chem. Phys., 2002,4, 3246-3251

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Diffusion in amorphous LiNbO₃ studied by ⁷Li NMR — comparison with the nano- and microcrystalline material

M. Wilkening, D. Bork, S. Indris and P. Heitjans, Phys. Chem. Chem. Phys., 2002, 4, 3246 DOI: 10.1039/B201193J

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