Speaker
Description
Due to the highest electronegativity of F ions, the highest electrical conductivity of fluorides [1] and the higher energy density (estimated theoretically [2]) than Li-ion batteries, metal fluorides attracted the attentions for all-solid-state battery materials for next generation. Since muon spin rotation and relaxation ($\mu$SR) method is used to study the dynamics of ions in battery materials [3,4], we performed $\mu$SR measurements in LaF3 with and without doped by Sr to understand the F ion dynamics in the temperature range 50 K – 470 K. At low temperatures, the static behavior is dominant showing the strong F-$\mu$-F bonds. However, at higher temperatures (> 300 K), the dynamic behavior is observed. Several trial models to understand those dynamic behavior of muon and F ions will be presented in the program.
[1] K. Mori, et al., J. Phys. Chem. C 124 (2020) 18452–18461.
[2] F. Gschwind, et al., J. Fluorine Chemistry 182 (2016) 76–90.
[3] J. Sugiyama, et al., Phys. Rev. Lett., 103 (2009) 147601.
[4] I. Umegaki, et al., Phys. Chem. Chem. Phys. 19 (2017) 19058-19066.
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