Issue 44, 2008
From the journal:

Journal of Materials Chemistry

Anion diffusivity in highly conductive nanocrystalline BaF2:CaF2 composites prepared by high-energy ball milling

Benjamin Ruprecht,a   Martin Wilkening,*ab   Stefan Steuernagelc  and  Paul Heitjansab  

* Corresponding authors

a Leibniz University Hannover, Institute of Physical Chemistry and Electrochemistry, Callinstr. 3a, Hannover, Germany
E-mail: wilkening@pci.uni-hannover.de, heitjans@pci.uni-hannover.de
Web: www.wilkening.pci.uni-hannover.de, www.heitjans.pci.uni-hannover.de
Fax: +49 511 762 19121

b Center for Solid State Chemistry and New Materials, Leibniz University, Hannover, Hannover, Germany

c Bruker Biospin GmbH, Silberstreifen, Rheinstetten, Germany

Abstract

We report on the fluorine diffusivity in nanocrystalline BaF2 and CaF2 as well as in BaF2:CaF2 composites prepared by high-energy ball milling. Mechanical treatment of polycrystalline BaF2 together with CaF2 results in a nanocrystalline composite with an unexpectedly high dc conductivity of about 0.1 mS cm−1 at 450 K. X-ray diffraction and 19F magic angle spinning NMR measurements at extraordinary high spinning speeds reveal that this can be explained inter alia by the interplay of structural disorder and the formation of a mixed (Ba,Ca)F2 phase.

Graphical abstract: Anion diffusivity in highly conductive nanocrystalline BaF2:CaF2 composites prepared by high-energy ball milling

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Article information

DOI
https://doi.org/10.1039/B811453F
Article type
Paper
Submitted
02 Jun 2008
Accepted
01 Sep 2008
First published
15 Oct 2008

J. Mater. Chem., 2008,18, 5412-5416

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Anion diffusivity in highly conductive nanocrystalline BaF2:CaF2 composites prepared by high-energy ball milling

B. Ruprecht, M. Wilkening, S. Steuernagel and P. Heitjans, J. Mater. Chem., 2008, 18, 5412 DOI: 10.1039/B811453F

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