Artículo
Hyperfine Field and Isomer Shift Evolution in Hydrogenated Nd–Fe–B Alloy
Saccone, F. D.; RodrÍguez Torres, Claudia Elena
; Sánchez, Francisco Homero
; Fernández van Raap, Marcela Beatriz
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Fecha de publicación:
06/2001
Editorial:
Kluwer Academic/Plenum Publ
Revista:
Hyperfine Interactions
ISSN:
0304-3843
Idioma:
Inglés
Tipo de recurso:
Artículo publicado
Clasificación temática:
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.
Palabras clave:
PERMANENT MAGNETS
,
ISOMER SHIFT
,
HYDORGENATION
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Articulos(IFLP)
Articulos de INST.DE FISICA LA PLATA
Articulos de INST.DE FISICA LA PLATA
Citación
Saccone, F. D.; RodrÍguez Torres, Claudia Elena; Sánchez, Francisco Homero; Fernández van Raap, Marcela Beatriz; Hyperfine Field and Isomer Shift Evolution in Hydrogenated Nd–Fe–B Alloy; Kluwer Academic/Plenum Publ; Hyperfine Interactions; 134; 1; 6-2001; 123-129
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