Magnetic Properties of the Compound Series Y(MnxFe1−x)2 and Y6(MnxFe1−x)23

Abstract

The pseudobinary systems Y(Mn_xFe_1−x)₂ and Y₆(Mn_xFe_1−x)₂₃ show complete solid solubility. The magnetization and the susceptibility from 80° to 1500°K have been measured. The Curie temperature and the magnetization are lowered by the addition of Mn to YFe₂ and Y₆Fe₂₃ and also by the addition of Fe to Y₆Mn₂₃. No magnetic ordering above 90°K is observed for Y(Mn_xFe_1−x)₂, if x>0.6 and for Y₆(Mn_xFe_1−x)₂₃, if 0.4<xxFe_1−x)₂ compounds a distribution of hyperfine fields determined by Mössbauer measurements is present, which results from the randomly distributed Fe atoms at the neighboring sites. In the Y₆(Mn_xFe_1−x)₂₃ series a twofold hyperfine field distribution is observed, arising from the four nonequivalent lattice sites and from the random distribution of Fe and Mn atoms on these sites.