PREPARATION AND MAGNETIC-PROPERTIES OF AMORPHOUS FE1-XBX (15-LESS-THAN-OR-EQUAL-TO X LESS-THAN-40 ATMOSPHERIC PERCENT) ALLOY PARTICLES

Amorphous Fe1-xBx alloy particles have been prepared in aqueous soluti ons by reduction of Fe2+ ions to the metallic state by the use of NaBH 4. It is demonstrated, that by changing the pH of the aqueous metal io n solution the amount of boron incorporated in the alloy particles can be varied between 15 and 28 at.%. Fe-57 Mossbauer spectra have been o btained at 10, 80 and 295 K. The hyperfine parameters for amorphous pa rticles have been found to be similar to those found for ribbons and f ilms prepared by the liquid-quench and sputtering techniques, respecti vely, though with a tendency for the magnetic hyperfine fields for the chemically prepared and sputter prepared alloys to deviate slightly f rom those for melt-spun samples. The magnetic hyperfine fields decreas e linearly as a function of T3/2.