Chemical reduction of hematite by sodium borohydride.
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Data
2005
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Resumo
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.
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Fe–B alloy, Hematite, Sodium borohydride, Mössbauer
Citação
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: <https://link.springer.com/article/10.1007/s10751-006-9254-0>. Acesso em: 20 abr. 2017.