Abstract
The structural change of nitrate intercalated graphite fibers prepared from cyanoacetylene (CA) were studied in air. Two kinds of 3rd stage graphite intercalation compounds are identified by X-ray diffraction measurements, one of which is a stable stage structure observed newly in this study. HNO 3-graphite fibers prepared from CA (H.T.T. 3000°C) change the structure from α-3rd stage ( Ic=14.50 A ̊ : di=7.80 A ̊ ) to β-3rd stage ( I=13.25 A ̊ : di=6.55 A ̊ ) in 8h after exposure to air, while the change occurs in less than 1h for fibers from benzene. The former retain β-3rd stage over 6 months, while the latter are unstable and are transformed into mixed structure with β-3rd stage compound and pristine graphite in a few days. Content of residual nitrogen in graphite fibers from CA (H.T.T. 3000°C) is estimated to be about 0.2 wt.% from elemental analysis. It is suggested that residual nitrogen atoms contribute to the structural stability of HNO 3-graphite fibers from CA.
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