Crystal and Magnetic Structure of Intermetallic Compounds of the Type Th(CoxFe1−x)5

The series Th(CoxFe1−x)5 was investigated by means of neutron diffraction. All compounds investigated (x = 0, 0.2, 0.4, 0.6, and 1.0) were found to crystallize in the hexagonal CaCu5 type of structure. Their lattice constants were determined at 4.2 K as well as at room temperature. It is shown that only part of these compounds are true ferromagnets. For the compounds with x = 0 and x = 0.2 antiferromagnetic cimponents are also present, leading to a doubling of the magnetic unit cell. For all compounds investigated the magnetic structure is given in detail.