AMORPHOUS IRON-BORON POWDERS PREPARED BY CHEMICAL-REDUCTION OF MIXED-METAL CATION SOLUTIONS - DEPENDENCE OF COMPOSITION UPON REACTION TEMPERATURE

By altering reaction temperature from -7 to 30 degrees C, the boron content in Fe-B amorphous powders can be regulated over a wide range, from 23 to 40 atom%; this results from the difference in the apparent activation energies for the deposition of iron and boron atoms.