Abstract
The mechanical spectrum of γ-Na 0.66CoO 2 below room temperature was measured using the vibrating reed method at kilohertz frequencies. In the cooling process, internal friction is less temperature dependent above 240 K and shows a continuous decrease with the decrease in temperature below 240 K in annealed γ-Na 0.66CoO 2 sample. A transition was suggested to occur around 240 K, which is proposed to be a freezing transition of the mobility of sodium atoms. A similar behavior was observed in as-prepared γ-Na 0.66CoO 2 sample. However, another internal friction peak appears around 160 K. This internal friction peak is expected to be a thermally activated relaxation peak with some relationship to oxygen vacancies.
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