Transition elements, nonmagnetic

The presence of magnetism amongst the 3d transition elements causes magnanese, iron, and cobalt not to obey the structural trend that is observed across the nonmagnetic 4d and 5d series. Manganese takes the a-Mn... 

There are two systems in which U is substituted by rare-earth elements Y and Tb. The first system is of special importance because as mentioned above, no Th compounds with high concentration of transition element are known and therefore Y can be used as a nonmagnetic diluent and its compounds as a standard with a nomnagnetic sublattice located at the 2(a) sites. 

Figure 10 presents the Curie temperature (T ) vs the TM-content (x) for Co- and Fe-based biaary alloys. Alloying rare-earth elements with small amounts of transition metals (x < 0.2) leads to a decrease ia Curie temperature. This is particularly obvious ia the Gd—Co system where it corresponds to a nonmagnetic dilution similar to that of Cu (41,42). This iadicates that TM atoms experience no exchange coupling unless they are surrounded by a minimum number j of other TM atoms. The critical number is j = 5 for Fe and j = 7 for Co. The steep iacrease of for Co-based alloys with x about 0.7 is based on this effect. 

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