Abstract
Powder mixtures of Fe 75-C 25 (both graphite and activated carbon) have been ball-milled in vacuum for periods of up to 285 h. X-ray diffraction, Mössbauer spectroscopy and thermal analysis measurements indicate that an amorphous Fe 3C-type phase is produced on short-term milling (less than 70 h), with a crystalline Fe 3C being obtained on further milling to 140 h. This Fe 3C-type phase was found to undergo partial carbon oxidation between 500 and 1000 °C during thermogravimetric measurement, indicating the metastable state of this phase. The carbon-rich Fe 7C 3 phase was observed on extended milling of Fe 75C 25 (graphite) to 285 h, in agreement with earlier findings.
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