INVESTIGADORES
RODRIGUEZ TORRES Claudia Elena
artículos
Título:
EXAFS determination of Hf localisation in HDDR-Nd-Fe-B-Hf alloys
Autor/es:
CLAUDIA E. RODRÍGUEZ TORRES; M. B. FERNÁNDEZ VAN RAAP; F. H SÁNCHEZ; A. F. PASQUEVICH
Revista:
PHYSICA B - CONDENSED MATTER
Referencias:
Año: 2005 vol. 362 p. 145 - 152
ISSN:
0921-4526
Resumen:
The local structure around Hf in Nd15.78Fe76.3xHfxB7.8 (x ¼ 0:1 and 0.2) submitted to conventional and solid hydrogenation.disproportionation.desorption.recombination (HDDR) sequence was studied by extended X-ray absorption .fine structure (EXAFS) in order to understand the relation between the presence of Hf and magnetic anisotropy found only in solid-HDDR samples. EXAFS results show that Hf is not in the Nd2Fe14B structure but incorporated into a local atomic arrangement (HfB ClNa-type) which is the same for as-cast, solid and conventional HDDR samples. It is concluded that the magnetic anisotropy induced by Hf addition to NdFeB alloys must be related to microstructural features incorporated into a local atomic arrangement.
