The carburization of iron oxide with carbon monoxide: Modifications of hägg iron carbide

Autor:	A. Pontello, E. H. Bean, W. C. Peebles, M. Mentser, E. M. Cohn, L. J. E. Hofer, K. H. Jack
Rok vydání:	2007
Předmět:	chemistry.chemical_compound Materials science chemistry Metallurgy Inorganic chemistry Curie Iron oxide Curie temperature Crystallite Direct reduced iron Catalysis Carbide Carbon monoxide
Zdroj:	Journal of Applied Chemistry. 5:418-425
ISSN:	1934-998X 0021-8871
DOI:	10.1002/jctb.5010050810
Popis:	This study was undertaken because of its potential use in catalysis as well as in metallurgy. Modifications of Hagg iron carbide, exhibiting differences in X-ray diffraction patterns and Curie points, have been observed; the differences appear to be linked to the mode of preparation. Carburization of reduced iron with carbon monoxide leads to ‘normal’ Hagg iron carbide with a Curie point at 245°to 250°; carburization of iron oxide produces Hagg iron carbide with a higher Curie point, up to 276°. The ‘high-Curie-point’ carbide progressively approaches the ‘normal’ form with increasing temperature and time of carburization. Possible explanations for the ‘high-Curie-point’ modification, based on the effect of oxygen, alkali, or crystallite size, are suggested. The Curie point of 247 ± 3°is that of pure, well-crystallized Hagg iron carbide.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::33dd593eb3732d6fef69ee1679e1d327 https://doi.org/10.1002/jctb.5010050810 Zobrazit plný text záznamu