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Abstract
R 2Fe 14C (R, rare earth metal) compounds are considered as new permanent magnetic materials of technical interest. Investigations of the compound Tm 2Fe 14C by means of X-ray and neutron diffraction as well as by metallographic techniques were carried out. Tm 2Fe 14C crystallizes in the tetragonal space group P4 2/ mnm and is isotypic to Nd 2Fe 14B. The lattice constants are a = 8.7304(2) Å and c = 11.7640(4) Å at 295 K. The nuclear and magnetic structure of Tm 2Fe 14C has been investigated by means of neutron diffraction at 650 K (above the Curie temperature T c), 400 K (above the spin reorientation temperature T SR and below T c), room temperature and 10 K. The magnetic moments of all Tm and Fe atoms are always oriented collinear and antiparallel. Measurement of the magnetization curve by means of neutron diffraction yields a T SR of 308 K, where the magnetization direction changes from parallel to the c axis above T SR to perpendicular to the c axis below T SR. The nuclear structure of Tm 2Fe 17C x (Th 2Ni 17 structure type) has been refined simultaneously since this phase was also present in the sample.
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