科研之友
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摘要
Data of Na-23 NMR spectra and relaxation measurements are interpreted as suggesting that, upon increasing temperature, the Na layers in Na0.8CoO2 adopt a 2D liquid state at T = 291 K. The corresponding first order phase transition is preceded by a rapidly increasing mobility and diffusion of Na ions above 200 K. Above 291 K, the Na-23 NMR response is similar to that previously observed in superionic conductors with planar Na layers.
- 出版日期2009-2-6
