Magnetic Properties of the R₂T₁₇-Type Compounds Y₂Co₁₇-x-yAlx

Abstract

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.