The Sm
2(Co
1-xAg
x)
17alloys in the concentration range

have been studied. The unit cell volume is found to increase by introducing Ag. The saturation magnetization monotonically decreases with x . The anisotropy constant K
1at room temperature increases from 3.2J/cm
3for Sm
2Co
17to 6.2 J/cm
3for Sm
2(Co
0.97Ag
0.03)
17. A small amount of Ag incorporated to Sm
2Co
17significantly beneficiates this material for permanent magnets fabrication.