The effect of reaction condition on composition and properties of ultrafine amorphous powders in (Fe, Co, Ni)-b systems prepared by chemical reduction

Junji Saida, Akihisa Inoue, Tsuyoshi Masumoto

Research output: Contribution to journalArticle

41 Citations (Scopus)

Abstract

Amorphous ultrafine powders in (Fe, Co, Ni)-B binary systems were prepared in different reduction conditions of metal ions in an aqueous solution by use of KBH4, with the aim of clarifying the effect of reaction conditions on the composition, thermal stability, and magnetic properties of the resultant amorphous powders. As the mol ratio of KBH4 to metal ions decreases, the structure of the ultrafine powders changes from amorphous to crystalline phase. The morphology of these powders is in a nearly spherical shape with a particle size of about 20 nm for the amorphous phase and changes to the chain-like or net-like shape for the crystalline phase. The B content in the Fe-B amorphous powder decreases with a decrease of the ratio of KBH4 to metal ions, and the powder size decreases with an increase of the reduction temperature.

Original languageEnglish
Pages (from-to)2125-2132
Number of pages8
JournalMetallurgical Transactions A
Volume22
Issue number9
DOIs
Publication statusPublished - 1991 Sep 1

ASJC Scopus subject areas

  • Engineering(all)

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