Characterization of dopants effects on structural and magnetic properties of Nd-Fe-B nanocomposites

RODRIGUEZ PRIETO, J. M.; PAMPILLO, L. G.; PRECKEL, S.; PAGNOLA, M.; SACCONE, F. D.; SIRKIN, H. R. M.

Salvador

Conferencia; The 14th International Conference on Rapidly Quenched and Metastable Materials RQ14; 2011

Universidad Federal de San Carlos

Nanocomposite Nd-Fe-B alloys are promising materials for permanent magnet applications [1]. These alloys are mainly produced by melt-spinning technique. Nanostructured materials are obtained in two different ways, as-quenched or by controlling the crystallization of amorphous precursors up to a desired grain size. For this work, we prepared nanocristalline Nd-Fe-B melt-spun ribbons in a controlled vaccum atmosphere. We analyzed crystallization kinetics by means of differential thermal analysis, Mössbauer effect spectroscopy and X-Ray diffraction techniques. Dependence of structural properties, such as grain size and transformation temperatures, are studied as a function of dopant concentrations (such as Ti and Cr). Magnetic properties, remanence and coercive fields, were measured and these properties are correlated with the nanostructure. We observed that the as-quenched Ti doped Nd10Fe80B10 ribbons retain a higher amount of amorphous phase and their crystallization temperature was determined as 760 C [2]. References [1] S. Sugimoto, J. Phys. D: Appl. Phys. 44 (2011) 064001 [2] L. G. Pampillo, S. Preckel, M. Pagnola, F. D. Saccone, Actas del 9° Congreso Internacional de Metalurgia y Materiales SAM-CONAMET Vol. 3, pp. 2103-2108 (2009), ISBN 978-987-1323-13-5