Resumen

PADUANI, C.; VALCANOVER, J. A.; ARDISSON, J. D.  y  YOSHIDA, M. I.. An investigation of structural and magnetic properties of the Nd₁₆Co_72-xRu_xC₁₁B coro-carbides. Braz. J. Phys. [online]. 2008, vol.38, n.2, pp. 259-263. ISSN 0103-9733.  http://dx.doi.org/10.1590/S0103-97332008000200008.

Nd₁₆Co_72-xRu_xC₁₁B boro-carbides have been prepared by arc melting and studied by X-ray diffraction and magnetization measurements. X-ray diffraction results confirm that all the prepared alloys possess the tetragonal 2:14:1 (P4₂/mmm) hard magnetic phase. The observed decrease of the magnetization and Curie temperature indicate the development of antiferromagnetic spin correlations with the increase of the Ru content. The combined addition of B and C is favorable to the formation and stabilization of the tetragonal phase in these compounds. At lower Ru contents the Curie temperature is higher than in the corresponding Co-based boride in spite of larger cell volumes.

Palabras llave : Rare-earths; Permanent magnets; Carbides; Borides; Ferromagnetism; Antiferromagnetism.