A new metastable phase in the Nd-Fe-B system

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  • Z. Altounian
    Department of Physics, McGill University, Montreal, Quebec H3A 2T8, Canada
  • D. H. Ryan
    Department of Physics, McGill University, Montreal, Quebec H3A 2T8, Canada
  • G. H. Tu
    Department of Physics, McGill University, Montreal, Quebec H3A 2T8, Canada

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<jats:p>A new metastable compound has been obtained during the crystallization of Fe-rich Nd-Fe-B amorphous alloys. The composition range for the precipitation of this phase is Nd4.5±1Fe82.5±5B12.5±3.5. A single phase, however, is obtained in a much restricted composition range. The amorphous alloy has a Curie temperature of 466 K and crystallizes at 852 K (for a heating rate of 40 K min−1 ) into the new metastable compound which has a body-centered-cubic structure with a=1.238 nm. Its Curie temperature is 548 K. Upon heating above 975 K, this phase transforms into Nd2Fe14B, NdFe12B6, and α-Fe. It appears that it is necessary to start from a truly amorphous state in order to form the new phase, otherwise, a competing body-centered-cubic phase Nd2Fe23B3 forms. X-ray diffraction and Mössbauer spectroscopy data are also presented and compared to that of Nd2Fe23B3.</jats:p>

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