Abstract
Ultrafine Fe−B amorphous alloy powders were prepared by reducing Fe2+ ions using KBH4 and NaBH4 in aqueous solution. Adjusting technological factors, the amorphous powders around the composition of Fe65B35 can be easily obtained, but in the vicinity of eutectic point (Fe80B20) a certain amount of α-Fe often appears in the samples. From the Mossbauer spectrum, the crystallization products of the Fe63B37 amorphous powder are α-Fe and Fe2B phases. The measurement of11B spin echo nuclear magnetic resonance (NMR) at 8K showed that Fe2B-like and Fe3B-like short range orders (SRO) exist in the amorphous powder of Fe76B24.
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