Resende, Valdirene Gonzaga deCosta, Geraldo Magela daGrave, Eddy DeDantas, Lucien2017-05-302017-05-302005RESENDE, 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. 2017.1572-9540http://www.repositorio.ufop.br/handle/123456789/7815Well-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.en-USrestritoFe–B alloyHematiteSodium borohydrideMössbauerArtigo publicado em periodicohttps://link.springer.com/article/10.1007/s10751-006-9254-0https://doi.org/10.1007/s10751-006-9254-0