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Modulated structure of $$alpha$$'-Na$$_{x}$$CoO$$_{2}$$

Miyazaki, Yuzuru*; Igawa, Naoki ; Yubuta, Kunio*; Kajitani, Tsuyoshi*

The crystal structure of polycrystalline $$alpha$$'-Na$$_{x}$$CoO$$_{2}$$ has been determined by means of the (3+1)-dimensional superspace group approach using the neutron powder diffraction and Rietveld analysis method. Na site in the$$alpha$$'-Na$$_{x}$$CoO$$_{2}$$ is modulated along ${it a}$- and ${it c}$-axes and periodic vacancy sites are existed. It was founded that the octahedrons and prisms of NaO are combined along ${it a}$-axis and that the CoO$$_{2}$$ layers are modulated along ${it c}$-axis.

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