抄録
Ternary R2T17-type alloys Y2Co17-x-yAlx were studied by means of X-ray diffraction and magnetization measurements.The crystal structures are Th2Ni17 type for alloys in which 0≤x< 5, and Th2Zn17-typefor alloys in which 5<x<8. The magnetizations and Curie temperatures decrease with increasing Al content x, and the dependences on x change at 4<x<5. Defects in the cobalt decrease the magnetization and Curie temperature. The nearly linear relation between the magnetization and Curie temperature is discussed in the light of the Stoner model.
