Production of amorphous Fe–B alloy and α-Fe by chemical reduction of hematite using sodium borohydride View Full Text


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Article Info

DATE

2006-10

AUTHORS

V. G. de Resende, G. M. da Costa, E. De Grave, L. Datas

ABSTRACT

Natural and well-crystallized hematite was suspended in water and treated at room-temperature (RT) with sodium borohydride in acid medium. 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. Further, the already present superficial, amorphous metallic Fe is converted to α-Fe and the original, plate like morphology of the hematite has changed to a mix of nodular and acicular particles. 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 a matrix of α-Fe2O3. More... »

PAGES

6843-6854

References to SciGraph publications

Identifiers

URI

http://scigraph.springernature.com/pub.10.1007/s10853-006-0953-3

DOI

http://dx.doi.org/10.1007/s10853-006-0953-3

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1006144174


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