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- W2044707955 abstract "We present a Raman study of structural and dynamical properties of the La0.5(Li,Na)0.5TiO3 perovskites, closely related to the La(2-x)/ 3LixTiO3 ionic conductors. Despite intense experimental effort, the structure, lithium location, and diffusion mechanism of these materials are still controversial. The structure of La0.5(Li,Na)0.5TiO3 compounds, in particular, has been refined as rhombohedral by neutron diffraction, with La and Na occupying randomly the A-type site. However, the correlation of their Raman spectra with those of La(2-x)/ 3LixTiO3 compounds indicates that some degree of cationic order is preserved on the nanometric scale and that rhombohedral symmetry may result from an average of ordered domains forming randomly. With regard to dynamical properties, we show that all compounds of the series with [Li] ≠ 0 present lithium diffusion, even for compositions below the percolation limit. This result is attributed to lithium diffusion being restricted, in such cases, to finite clusters, not contributing to macroscopic conductivity but being detected by Raman scattering due to the sensitivity of this technique to local environments." @default.
- W2044707955 created "2016-06-24" @default.
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- W2044707955 date "2005-10-05" @default.
- W2044707955 modified "2023-10-17" @default.
- W2044707955 title "On the Local Structure and Lithium Dynamics of La<sub>0.5</sub>(Li,Na)<sub>0.5</sub>TiO<sub>3</sub> Ionic Conductors. A Raman Study" @default.
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- W2044707955 doi "https://doi.org/10.1021/cm0517770" @default.
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