| 摘要 |
An iron-based rare earth alloy nanocomposite magnet has a composition represented by (Fe<SUB>1-m</SUB>T<SUB>m</SUB>)<SUB>100-x-y-z</SUB>Q<SUB>x</SUB>R<SUB>y</SUB>Ti<SUB>z</SUB>, where T is Co and/or Ni, Q is B and/or C and R is rare earth element(s) including substantially no La or Ce. x, y, z and m satisfy 10 at %<x<=17 at %, 7 at %<=y<10 at %, 0.5 at %<=z<=6 at % and 0<=m<=0.5, respectively. The magnet includes crystal grains of an R<SUB>2</SUB>T<SUB>14</SUB>Q type compound having an average grain size of 20 nm to 200 nm and a ferromagnetic iron-based boride that exists in a grain boundary between the crystal grains of the R<SUB>2</SUB>T<SUB>14</SUB>Q type compound. The boride is dispersed in, or present in the form of a film over, the grain boundary to cover at least partially the surface of the crystal grains of the R<SUB>2</SUB>T<SUB>14</SUB>Q type compound.
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