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http://www.repositorio.ufop.br/jspui/handle/123456789/7815
Título: | Chemical reduction of hematite by sodium borohydride. |
Autor(es): | Resende, Valdirene Gonzaga de Costa, Geraldo Magela da Grave, Eddy De Dantas, Lucien |
Palavras-chave: | Fe–B alloy Hematite Sodium borohydride Mössbauer |
Data do documento: | 2005 |
Referência: | 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. |
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. |
URI: | http://www.repositorio.ufop.br/handle/123456789/7815 |
Link para o artigo: | https://link.springer.com/article/10.1007/s10751-006-9254-0 |
DOI: | https://doi.org/10.1007/s10751-006-9254-0 |
ISSN: | 1572-9540 |
Aparece nas coleções: | DEQUI - Artigos publicados em periódicos |
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ARTIGO_ChemicalRedutionHematite.pdf Restricted Access | 303,14 kB | Adobe PDF | Visualizar/Abrir |
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