INVESTIGADORES
RODRIGUEZ TORRES Claudia Elena
artículos
Título:
Hyperfine Field and Isomer Shift Evolution in Hydrogenated Nd–Fe–B Alloy
Autor/es:
SACCONE, F.D.; RODRÍGUEZ TORRES, C.E.; SÁNCHEZ, F.H.; FERNÁNDEZ VAN RAAP, M.B.
Revista:
HYPERFINE INTERACTIONS
Editorial:
Kluwer Academic Publishers
Referencias:
Año: 2001 vol. 134 p. 123 - 129
ISSN:
0304-3843
Resumen:
RE2Fe14B (RE=rare earth) materials are capable of absorbing hydrogen to form a stable solid solution at room temperature. Hydrogenation produces a number of significant changes in the hyperfine interactions. In this work, 57Fe Mössbauer effect spectroscopy and X-ray diffraction measurements were performed on Nd14.01Hf0.08Fe78.91B7.00 alloys submitted to thermal treatment in hydrogen atmosphere. A non-linear increase of the hyperfine fields and isomer shifts with hydrogen concentration was observed. The hyperfine parameters of the 8j1 site exhibit a rather different evolution than those experienced by the other major sites (8j2, 16k1, 16k2). The origin of the hyperfine field enhancement is analyzed in terms of volume expansion and H nearest neighbors to the Fe sites. A linear expression on these two effects to give account of isomer shift evolution for 8j1 site is given.
