The effect of reaction condition on composition and properties of ultrafine amorphous powders in (Fe,Co, Ni)-b systems prepared by chemical reduction |
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| Authors: | Junji Saida Akihisa Inoue Tsuyoshi Masumoto |
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| Affiliation: | (1) Institute for Materials Research, Tohoku University, Japan;(2) Steel Research and Development Laboratories, Nisshin Steel Co., Ltd., 592 Sakai, Japan;(3) Institute for Materials Research, Tohoku University, 980 Sendai, Japan |
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| 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. |
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