Magnetic and metallurgical properties of Sm(Co,Fe,Cu,Zr)zalloys near z = 8.5

Very large intrinsic coercivities, ranging from 28-32kOe, combined with saturation inductions ranging from 11.6- 12.1kG have been obtained in bulk alloys corresponding to the compositions Sm(Co.90-vFevCu.08Zr.02)8.35with v=0.23- 0.30. We do not observe a drop in 4πMsasMHcreaches high levels nor a significant drop inMHcat high Fe contents.