Reduction of magnetite to metallic iron: Morphology of ammonia synthesis catalyst

Autor:	L. A. Kristiansen, T. Fuglerud, Johan Taftø
Rok vydání:	1991
Předmět:	Materials science Condensed Matter Physics Catalysis Metal Ammonia production Crystal chemistry.chemical_compound Crystallography Electron diffraction Chemical engineering chemistry Transmission electron microscopy visual_art X-ray crystallography visual_art.visual_art_medium Magnetite
Zdroj:	Philosophical Magazine Letters. 64:105-109
ISSN:	1362-3036 0950-0839
Popis:	An ammonia synthesis catalyst, fabricated by reducing magnetite (Fe3O4) containing small amounts of Al2O3, CaO and K2O, was studied using transmission electron microscopy. It is observed that the Fe3O4 crystal grains are transformed into porous or spongy single crystals of body centred cubic iron (α-Fe) extending over large distances (more than l0 μm). Within the original magnetite grain three orientations of the porous α-Fe crystals are observed consistent with a Bain transformation during reduction. The three orientations of the cubic α-Fe crystal grains within the original magnetite crystal grain result from a 45° rotation of the α-Fe crystal unit cell around the three equivalent (100) axes of magnetite.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::724a3d78f2f37ee60d088f10b3de68ec https://doi.org/10.1080/09500839108214674 Zobrazit plný text záznamu