METASTABLE SINGLE-CRYSTAL RARE EARTH MAGNET FINE POWDER AND METHOD FOR PRODUCING SAME

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A single crystal particle powder having a crystal structure of TbCu7-type of the present invention is represented by the general formula : [Chemical Formula 1]         (R1-zMz)Tx     (1) or the general formula : [Chemical Formula 2]         (R1-zMz)TxNy     (2) and has a crystal structure of TbCu7-type, wherein R is at least one element selected from the group consisting of Sm and Nd, T is at least one element selected from the group consisting of Fe and Co, x is 7.0 ≤ x ≤ 10.0, y is 1.0 ≤ y ≤ 2.0, and z is 0.0 ≤ z ≤ 0.3.