Abstract
A systematic characterization of the Dy 15 Fe 77( B 1− y C y ) 8 system with 0 ≤ y ≤ 1 by means of X-ray diffraction techniq ues, Mössbauer spectroscopy and thermomagnetic measurements has been performed. The existence of two magnetic carbides, Dy 2Fe 14C and Dy 2 Fe 17− x C y (3 ≤ x ≤ 0), was evidenced. Dy 2Fe 14C, formed only by relative long annealing at 9 00°C having a C doped Dy 2Fe 17 phase as precursor, has a tetragonal structure similar to that of the corresponding boride. The Curie temperature of Dy 2 Fe 14 B 1− y C y is lowered with C addition while a appreciable increase was observed when iron is partially substituted by cobalt in the Dy 15Fe 77C 8 system. The hyperfine parameters of the iron sites for the Mössbauer spectrum of the 2:14:1 tetragonal carbide are presented. Dy 2Fe 17- x C y is formed by annealing at T > 900°C. Variations of lattice parameters and magnetic properties suggest a variation in the phase stoichiometry. X-ray analysis indicate a disordered structure based on that of RE 2Fe 17 with insertion of carbon atoms on the plane of Dy layers. This phase, with reduced C insertion, is presented in the as-cast material.
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