@article{oai:ynu.repo.nii.ac.jp:00003924,
 author = {Nagasawa, K. and Nakatsugawa, Hiroshi},
 journal = {Proceedings of the 22nd International Conference on Thermoelectrics (ICT2003) 17-21 August},
 month = {},
 note = {application/pdf, The electron density distributions of ＄γ-Na_{x}CoO_{2}＄ have been obtained by the maximum entropy method and the Rietveld analysis using synchrotron radiation X-ray diffracton data at 100K, 200K and 300K . In the Rietveld refinement, the deviation of (008) and (108) peaks is very large relative to that of other reflections with increase of Na contant x. And same behavior showed by the change of ttemperature. Electron density distribution based on synchrotron radiation X-ray diffraction data showed the direct observation of the formation of the Co-O hybridization with increasing the Na content. This means increase of covalency between O 2p and ＄Co t_{2g}＄ in the ＄CoO_{2}＄ layer. But not showed the change of electron density distribution between 100K and 300K. These facts indicate the essential difference for respective cause of the peak deviation.Key words:＄γ-Na_{x}CoO_{2}＄, Synchrotron radiation X-ray diffraction, Maximum Entropy Method.},
 pages = {223--226},
 title = {Crystal structure, electric and magnetic properties in Nax＄CoO_{2}＄},
 year = {2003}
}