An amorphous Fe-B system was studied in composition range from 12.5at%B to 24.9at%B by magnetic measurements and Mössbauer spectroscopy. It was found that samples of low B content exhibit crystallization in two stages while in the case of higher B concentration a single stage crystallization occurs. In most cases during the crystallization an intermediate metastable crystalline phase Fe3B is formed, which decomposes into α-Fe+Fe2B at higher temperatures. The temperature stability of Fe3B compound reaches its maximum at about 20% B concentration. A tentative explanation to this experimetal fact is presented.
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Tarnóczi et al. (1978) studied this question.
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