Abstract
The ternary R2T17-type alloys Dy2Fe17-x-yAlx with Fe deficiency have been studied by means of X-ray diffraction and magnetization measurements. The single phase boundary of R2T17-type structure was determined to be near the composition Dy2Fe9Alx for x≥4 and Dy2Fe13-xAlx for x≤4. The crystal structures are of the Th2Ni17-type for alloys with x≤5 while a Th2Zn17-type for those with 6≤x≤8. The thermo-magnetic curves show that the magnetism varies from P-type to N-type ferri-magnetism with an increase in the Al content x. Three types of spin arrangements, in which x≤2, 2<x≤5, 6≤x≤8, were proposed on the basis of the magnetic studies. It was concluded that the substitution of Al for Fe causes a derease in the Fe magnetic moment, but that defects in the Fe cause an increase in the Fe magnetic moment.
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