Li ion diffusion in LiAlO2 investigated by Raman spectroscopy

• The Li ions undergo positional disordering along the structural channels on heating.
• An anomalous maximum in the bandwidths of the Li ions related modes is observed.
• A model is used to describe the linewidth of a phonon.
• The activation energy of Li ions is about 0.5 eV.

The temperature dependence of Li ions behavior of γ-LiAlO2 has been studied from 78 to 873 K. On heating, the Li ions underwent positional disordering along the structural channels, with the Li ions related modes at 220, 366 and 400 cm−1 broadening and weakening dramatically. An anomalous maximum in the bandwidths of the Li ions related modes is observed. It should be apparent that there are at least two distinct thermally activated processes. A model suggested by Andrade and Porto is used to describe the linewidth of a phonon.

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