MAGNETIC-PROPERTIES OF Y2(FE1-XALX)17 PSEUDOBINARY COMPOUNDS

By means of X-ray phase analysis it is shown that the Y//2(Fe//1// minus //xAl//x)//1//7 compounds crystallize with either the hexagonal Th//2Ni//1//7-type structure or the rhombohedral Th//2Zn//1//7-type structure for x less than equivalent to 0. 18 and 0. 25 less than equivalent to x less than equivalent to 0. 45 respectively. It was observed that the lattice constants obey Vegard's law. For the relation between the Curie temperature and the aluminium concentration a maximum was observed for x equals 0. 18. The magnetic moment of iron in the compounds investigated decreases from 1. 90 mu //B to 1. 20 mu //B for x equals 0. 06 and x equals 0. 41 respectively.