Abstract
Preparation and characterization of sodium-graphite intercalation compounds were investigated. It was confirmed that the resulting compound (NaC x ) had the stage 8 structure with identity period of 2.8 nm. The Raman spectroscopy showed that the G-band signal of NaC x was observed at 1582 cm −1 and at 1608 cm −1 , which is a typical indication of the formation of intercalation compounds. The g-value of NaC x was determined to be 2.0018 by the ESR measurement, which was very close to the reported values for the other alkali metal-graphite intercalation compounds. The electrical resistivity of NaC x was about 1/3 of that of host graphite at room temperature and showed metallic temperature dependence.
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