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- Title
F anion dynamics in cation-mixed nanocrystalline LaF<sub>3</sub>: SrF<sub>2</sub>.
- Authors
Breuer, S.; Lunghammer, S.; Kiesl, A.; Wilkening, M.
- Abstract
Ion dynamics in nanocrystalline materials can be quite different compared to that in materials with μ<inline-graphic></inline-graphic>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 SrF2<inline-graphic></inline-graphic> into the tysonite structure of LaF3<inline-graphic></inline-graphic> and its effect on F-<inline-graphic></inline-graphic> transport. High-energy ball milling directly transforms the binary fluorides in a structurally disordered, phase pure nanocrystalline ceramic. Compared to Sr-free LaF3<inline-graphic></inline-graphic>, 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<inline-graphic></inline-graphic> of long-range ionic transport in the solid solution La1-xSrxF3-x<inline-graphic></inline-graphic> significantly decreases from 0.75 eV (x=0<inline-graphic></inline-graphic>) to 0.49 eV (x=0.1<inline-graphic></inline-graphic>).
- Subjects
NANOCRYSTAL synthesis; CATIONS; TYSONITE; CHEMICAL structure; ORGANIC synthesis
- Publication
Journal of Materials Science, 2018, Vol 53, Issue 19, p13669
- ISSN
0022-2461
- Publication type
Article
- DOI
10.1007/s10853-018-2361-x