Preprint Article Version 1 This version is not peer-reviewed

Fluorine Translational Anion Dynamics in Nanocrystalline Ceramics: SrF2-YF3 Solid Solutions

Version 1 : Received: 24 January 2018 / Approved: 25 January 2018 / Online: 25 January 2018 (04:46:39 CET)

A peer-reviewed article of this Preprint also exists.

Breuer, S.; Stanje, B.; Pregartner, V.; Lunghammer, S.; Hanzu, I.; Wilkening, M. Fluorine Translational Anion Dynamics in Nanocrystalline Ceramics: SrF2-YF3 Solid Solutions. Crystals 2018, 8, 122. Breuer, S.; Stanje, B.; Pregartner, V.; Lunghammer, S.; Hanzu, I.; Wilkening, M. Fluorine Translational Anion Dynamics in Nanocrystalline Ceramics: SrF2-YF3 Solid Solutions. Crystals 2018, 8, 122.

Journal reference: Crystals 2018, 8, 122
DOI: 10.3390/cryst8030122

Abstract

Nanostructured materials have already become an integral part of our daily life. In many applications ion mobility decisively affects the performance of, e.g., batteries and sensors. Nanocrystalline ceramics often exhibit enhanced transport properties due to their heterogeneous structure showing crystalline (defect-rich) grains and disordered interfacial regions. In particular, anion conductivity in nonstructural binary fluorides easily exceeds that of their coarse-grained counterparts. To further increase ion dynamics aliovalent substitution is a practical method to influence the number of (i) defect sites and (ii) the charge carrier density. Here, we used high energy-ball milling to incorporate Y3+ ions into the cubic structure of SrF2. As compared to pure nanocrystalline SrF2 the ionic conductivity of Sr1-xYxF2+x with x = 0.3 increased by 4 orders of magnitude reaching 0.8 x 10 -5 S/cm-1 at 450 K. We discuss the effect of YF3 incorporation on conductivities isotherms determined by both activation energies and Arrhenius pre-factors. The enhancement seen is explained by size mismatch of the cations involved, which are forced to form a cubic crystal structure with extra F anions if x is kept smaller than 0.5

Subject Areas

nanocrystalline ceramics; ionic transport; mechanochemsitry; NMR; conductivity spectroscopy; fluorides

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