Ferromagnetism strengthening in the Lu2Fe17−xMnx system

The compounds Lu2Fe17−xMnx, in which x = 0 – 2 , with the Th2Ni17-type crystal structure were synthesized. Their structural and magnetic properties are presented. The Lu2Fe17−xMnx compounds with x = 0 – 0.5 are ferromagnets at low temperatures and antiferromagnets at high temperatures. Their temperature of “ferromagnet–antiferromagnet” phase transition surprisingly increases very fast from 135 to 253 K with a growing content of Mn, whereas Néel temperature stays practically unchanged (∼278 K) and is close to Curie temperature T C = 287 K for the compound with x = 0.7 . The compounds from the range x = 0.7 – 2 are ferromagnets only with a near constant T C ( x ) value.