Fluorine translational anion dynamics in nanocrystalline ceramics: SrF2-YF3 solid solutions

Stefan Breuer, Bernhard Stanje, Veronika Pregartner, Sarah Lunghammer, Ilie Hanzu, Martin Wilkening

Publikation: Beitrag in einer FachzeitschriftArtikelForschungBegutachtung

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−x Yx F2+x with x = 0.3 increased by 4 orders of magnitude reaching 0.8 × 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.

Originalspracheenglisch
Aufsatznummer122
FachzeitschriftCrystals
Jahrgang8
Ausgabenummer3
DOIs
PublikationsstatusVeröffentlicht - 5 Mär 2018

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Fluorine
Anions
fluorine
Solid solutions
solid solutions
Negative ions
ceramics
Ions
anions
conductivity
Defects
ions
defects
Ball milling
Ionic conductivity
Charge carriers
Fluorides
Nanostructured materials
Transport properties
ion currents

Schlagwörter

    ASJC Scopus subject areas

    • !!Chemical Engineering(all)
    • !!Materials Science(all)
    • !!Condensed Matter Physics
    • Anorganische Chemie

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    Fluorine translational anion dynamics in nanocrystalline ceramics : SrF2-YF3 solid solutions. / Breuer, Stefan; Stanje, Bernhard; Pregartner, Veronika; Lunghammer, Sarah; Hanzu, Ilie; Wilkening, Martin.

    in: Crystals, Jahrgang 8, Nr. 3, 122, 05.03.2018.

    Publikation: Beitrag in einer FachzeitschriftArtikelForschungBegutachtung

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    AU - Stanje, Bernhard

    AU - Pregartner, Veronika

    AU - Lunghammer, Sarah

    AU - Hanzu, Ilie

    AU - Wilkening, Martin

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