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Title: Chemical reduction of hematite by sodium borohydride.
Authors: Resende, Valdirene Gonzaga de
Costa, Geraldo Magela da
Grave, Eddy De
Dantas, Lucien
Keywords: Fe–B alloy
Sodium borohydride
Issue Date: 2005
Citation: RESENDE, V. G. de et al. Chemical reduction of hematite by sodium borohydride. Hyperfine Interactions, Netherlands, v. 165, n.1-4, p. 113-119, 2005. Disponível em: <>. Acesso em: 20 abr. 2017.
Abstract: Well-crystallized hematite was suspended in water and treated at roomtemperature (RT) with sodium borohydride. The product of the reaction is a highly magnetic black powder, which is stable at RT. The NaBH4 treatment converts about half of the hematite to an amorphous Fe–B alloy and to a small fraction of sub-micron sized, amorphous metallic-Fe nodules. Heating at 400°C of this composite has resulted in the crystallization and/or oxidation of more than half of the amorphous Fe–B phase to α-Fe and Fe3O4 and B2O3, respectively. After treatment at 800°C, the metallic Fe and the amorphous Fe–B have completely vanished, and the resulting product consists of hematite and FeBO3 embedded in the matrix of α-Fe2O3.
ISSN: 1572-9540
Appears in Collections:DEQUI - Artigos publicados em periódicos

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