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Reduction of magnetite to metallic iron: Morphology of ammonia synthesis catalyst
- Source :
- Philosophical Magazine Letters; August 1991, Vol. 64 Issue: 2 p105-109, 5p
- Publication Year :
- 1991
-
Abstract
- 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.
Details
- Language :
- English
- ISSN :
- 09500839 and 13623036
- Volume :
- 64
- Issue :
- 2
- Database :
- Supplemental Index
- Journal :
- Philosophical Magazine Letters
- Publication Type :
- Periodical
- Accession number :
- ejs11800376
- Full Text :
- https://doi.org/10.1080/09500839108214674