Fe-B and Fe-CO-B alloy particles have been prepared by reduction of metal ions in aqueous solution by use of KBH 4 and NaBH 4 . It is shown that the boron content in the particles can be varied by changing the concentration of borohydride and the Fe/Co ratio. For the lowest boron concentrations a mixture of crystalline and amorphous alloysis formed. For higher boron concentrations all the material is amorphous.
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Wells et al. (1989) studied this question.