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The magnetic properties of Sm2(Co,Fe,Cu,Zr)17 alloys are very sensitive to heat treatments.A magnet with Br of 1.08 T,Hci of 2 312 kA*m-1 and ( BH )max of 211.0 kJ*m-3 has been obtained after sintering at 1 201 ℃ and aging at 830 ℃.The magnet has a very l