Mechanical spectrum and oxygen vacancies in γ-Na0.66CoO2
作者： L. Zhang , X.N. Ying , Z.C. Xu
DOI: 10.1016/J.JALLCOM.2011.01.131
关键词: Sodium 、 Internal friction 、 Annealing (metallurgy) 、 Phase transition 、 Chemistry 、 Analytical chemistry 、 Oxygen 、 Activation energy 、 Thermodynamics
摘要: Abstract The mechanical spectrum of γ-Na 0.66 CoO 2 below room temperature was measured using the vibrating reed method at kilohertz frequencies. In cooling process, internal friction is less dependent above 240 K and shows a continuous decrease with in annealed sample. A transition suggested to occur around 240 K, which proposed be freezing mobility sodium atoms. similar behavior observed as-prepared However, another peak appears 160 K. This expected thermally activated relaxation some relationship oxygen vacancies.
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