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 language | English |
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Pages (from-to) | 13669-13681 |
Number of pages | 13 |
Journal | Journal of Materials Science |
Volume | 53 |
Issue number | 19 |
DOIs | |
Publication status | Published - 1 Oct 2018 |
ASJC Scopus subject areas
- Materials Science(all)
- Mechanics of Materials
- Mechanical Engineering