INTECIN   20395
INSTITUTO DE TECNOLOGIAS Y CIENCIAS DE LA INGENIERIA "HILARIO FERNANDEZ LONG"
Unidad Ejecutora - UE
congresos y reuniones científicas
Título:
Surface analysis of NdyFe(86-y-x)B14Mx (M=Ti, Nb) ribbons with XPS technique using synchrotron radiation
Autor/es:
BILOVOL, V.; L. G. PAMPILLO; FERRARI, S.; M. PAGNOLA; F. D. SACCONE
Reunión:
Workshop; Surface and Interface Properties and Engineering - SIPE2012; 2012
Resumen:
Nd-Fe-B ferromagnets with low concentrations of Nd, have attracted technological interest in recent years due to their interesting magnetic properties such as high remanence and energy product thereby increasing their performance. Low concentration of Nd and the use of refractory elements, minimize the risk of oxidation, and control the obtaining of nanostructure in the solidification process with subsequent thermal treatments. Two systems of NdyFe(86-y-x)B14Mx (x=2, 4; y=7,8; M=Ti, Nb) in ribbon form were prepared by melt-spinning technique with 2% or 4% of the additive (M) as quenched (amorphous) and after that thermally treated at 700°C (crystalline) for 10 min. The surfaces of the ribbons were explored with X-ray photoelectron spectroscopy (XPS) using synchrotron radiation (LNLS, Campinas) with much emphasis on the additive elements. For each system the additives on the surface of the ribbons are found in both metallic and oxidized state. For titanium series, it was noted that the samples thermally treated have higher quantity of Ti0 than as quenched ones. While for niobium series, the samples with Nb=2 and Nd=8 (both as quenched and treated) are less oxidized ones.