2024-03-28T09:51:40Zhttps://eprints.lib.hokudai.ac.jp/dspace-oai/requestoai:eprints.lib.hokudai.ac.jp:2115/729252022-11-17T02:08:08Zhdl_2115_20045hdl_2115_139Graphite Formation at 1150-1200°C from Hard-carbon Precursors and MagnetiteKonno, HidetakaFujita, KeikoHabazaki, HirokiInagaki, MichioCatalytic graphitizationHard carbonOrganic polymer compoundsTransmission electron microscopyGraphite crystals were formed from a mixture of poly (vinyl pyrrolidone) (PVP) or polyacrylamide (PAA) pow-der and magnetite powder at 1150-1200°C. The graphite was identified by X ray diffraction and transmission elec-tron microscopy. The carbon yield from PAA at 1200°C was about four times of that from PVP, but PAA needed pro-longed heat treatment to transform turbostratic carbon to graphite. The graphite formation with magnetite from hard-carbon precursors (PVP and PAA) required higher temperatures and longer treatment time than with magnetite and soft-carbon precursors, such as poly (vinyl chloride) (PVC) and poly (vinyl alcohol) (PVA). Electron microscopic observations suggested that in addition to a carbide mechanism, a dissolution-precipitation mechanism may also take part in the graphitization of carbon derived from PVP and PAA.炭素材料学会Journal Articleapplication/pdfhttp://hdl.handle.net/2115/72925https://eprints.lib.hokudai.ac.jp/dspace/bitstream/2115/72925/1/tanso203-113.pdf0371-53451884-5495AA00140335炭素20022031131162002-07-25enginfo:doi/10.7209/tanso.2002.113著作権は炭素材料学会にある。利用は著作権の範囲内に限られるpublisher