Jump to main content
Jump to site search

Issue 20, 2014
Previous Article Next Article

Correlated fluorine diffusion and ionic conduction in the nanocrystalline F solid electrolyte Ba0.6La0.4F2.419F T1(ρ) NMR relaxation vs. conductivity measurements

Author affiliations

Abstract

Chemical reactions induced by mechanical treatment may give access to new compounds whose properties are governed by chemical metastability, defects introduced and the size effects present. Their interplay may lead to nanocrystalline ceramics with enhanced transport properties being useful to act as solid electrolytes. Here, the introduction of large amounts of La into the cubic structure of BaF2 served as such an example. The ion transport properties in terms of dc-conductivity values of the F anion conductor Ba1−xLaxF2+x (here with x = 0.4) considerably exceed those of pure, nanocrystalline BaF2. So far, there is only little knowledge about activation energies and jump rates of the elementary hopping processes. Here, we took advantage of both impedance spectroscopy and 19F NMR relaxometry to get to the bottom of ion jump diffusion proceeding on short-range and long-range length scales in Ba0.6La0.4F2.4. While macroscopic transport is governed by an activation energy of 0.55 to 0.59 eV, the elementary steps of hopping seen by NMR are characterised by much smaller activation energies. Fortunately, we were able to deduce an F self-diffusion coefficient by the application of spin-locking NMR relaxometry.

Graphical abstract: Correlated fluorine diffusion and ionic conduction in the nanocrystalline F− solid electrolyte Ba0.6La0.4F2.4—19F T1(ρ) NMR relaxation vs. conductivity measurements

Back to tab navigation

Article information


Submitted
28 Jan 2014
Accepted
26 Mar 2014
First published
31 Mar 2014

This article is Open Access

Phys. Chem. Chem. Phys., 2014,16, 9580-9590
Article type
Paper
Author version available

Correlated fluorine diffusion and ionic conduction in the nanocrystalline F solid electrolyte Ba0.6La0.4F2.419F T1(ρ) NMR relaxation vs. conductivity measurements

F. Preishuber-Pflügl, P. Bottke, V. Pregartner, B. Bitschnau and M. Wilkening, Phys. Chem. Chem. Phys., 2014, 16, 9580
DOI: 10.1039/C4CP00422A

This article is licensed under a Creative Commons Attribution-NonCommercial 3.0 Unported Licence. Material from this article can be used in other publications provided that the correct acknowledgement is given with the reproduced material and it is not used for commercial purposes.

Reproduced material should be attributed as follows:

  • For reproduction of material from NJC:
    [Original citation] - Published by The Royal Society of Chemistry (RSC) on behalf of the Centre National de la Recherche Scientifique (CNRS) and the RSC.
  • For reproduction of material from PCCP:
    [Original citation] - Published by the PCCP Owner Societies.
  • For reproduction of material from PPS:
    [Original citation] - Published by The Royal Society of Chemistry (RSC) on behalf of the European Society for Photobiology, the European Photochemistry Association, and RSC.
  • For reproduction of material from all other RSC journals:
    [Original citation] - Published by The Royal Society of Chemistry.

Information about reproducing material from RSC articles with different licences is available on our Permission Requests page.


Social activity

Search articles by author

Spotlight

Advertisements