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Pure and impure graphite powders, and two samples of highly oriented pyrolytic graphite (HOPG) have been studied by X-ray diffraction, electron microscopy, magnetometry and 57 Fe Mössbauer spectrometry in order to identify the distribution of iron impurities and establish their role in the weak ferromagnetism of some of these materials. Pure graphite powder (99.9995%) shows straightforward...
Carbon–nitrogen whiskers have been prepared by pyrolysis of 1,2-diaminopropane at 950°C or of allylamine at 900°C followed by quenching. They are scrolls of carbon film typically 250nm thick and up to 1mm long with about five layers in a structure like a “cigare russe” or “brandy snap”, about 50μm in diameter. Approximately 8wt% of nitrogen is incorporated into the carbon films, which are practically...
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