F anion dynamics in cation-mixed nanocrystalline LaF3: SrF2
Source abstract
Abstract
Ion dynamics in nanocrystalline materials can be quite different compared to that in materials with $$\upmu $$ m-sized crystallites. In particular, the substitution of iso- or aliovalent ions opens pathways to systematically control ion transport properties. Here we studied the incorporation of $${\text {SrF}}_2$$ into the tysonite structure of $${\text {LaF}}_3$$ and its effect on F $$-$$ transport. High-energy ball milling directly transforms the binary fluorides in a structurally disordered, phase pure nanocrystalline ceramic. Compared to Sr-free $${\text {LaF}}_3$$ , ionic conductivity could be increased by several orders of magnitude. We attribute this enhancement to the generation of lattice strain and the formation of F defect sites. In agreement with this increase, the activation energy $$E_{{\mathrm{a}}}$$ of long-range ionic transport in the solid solution $${\text {La}}1-x{\text {Sr}}x{\text {F}}3-x$$ significantly decreases from 0.75 eV ( $$x=0$$ ) to 0.49 eV ( $$x=0.1$$ ).
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Research context
OpenAlex topics: Inorganic Fluorides and Related Compounds · Inorganic Chemistry and Materials · Advanced Condensed Matter Physics
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References (43)
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