F anion dynamics in cation-mixed nanocrystalline LaF3: SrF2

S. Breuer, S. Lunghammer, A. Kiesl, M. Wilkening*

*Corresponding author for this work

Research output: Contribution to journalArticle

Abstract

Ion dynamics in nanocrystalline materials can be quite different compared to that in materials with μ 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 SrF 2 into the tysonite structure of 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 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 Ea of long-range ionic transport in the solid solution La 1 - xSr xF 3 - x significantly decreases from 0.75 eV (x= 0) to 0.49 eV (x= 0.1).

Original languageEnglish
Pages (from-to)13669-13681
Number of pages13
JournalJournal of Materials Science
Volume53
Issue number19
DOIs
Publication statusPublished - 1 Oct 2018

ASJC Scopus subject areas

  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering

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