Hyperfine field and isomer shift evolution in hydrogenated Nd-Fe-B alloy

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 Mossbauer effect spectroscopy and X-ray diffraction measurements were per...

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Autores principales: Saccone, Fabio Daniel, Rodríguez Torres, Claudia Elena, Sánchez, Francisco Homero, Fernández van Raap, Marcela Beatriz
Formato: Articulo
Lenguaje:Español
Publicado: 2001
Materias:
Física
Mössbauer spectroscopy
X-ray diffraction
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/142778
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-142778
record_format dspace
institution Universidad Nacional de La Plata
institution_str I-19
repository_str R-120
collection SEDICI (UNLP)
language Español
topic Física
Mössbauer spectroscopy
X-ray diffraction
spellingShingle Física
Mössbauer spectroscopy
X-ray diffraction
Saccone, Fabio Daniel
Rodríguez Torres, Claudia Elena
Sánchez, Francisco Homero
Fernández van Raap, Marcela Beatriz
Hyperfine field and isomer shift evolution in hydrogenated Nd-Fe-B alloy
topic_facet Física
Mössbauer spectroscopy
X-ray diffraction
description 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 Mossbauer 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.
format Articulo
Articulo
author Saccone, Fabio Daniel
Rodríguez Torres, Claudia Elena
Sánchez, Francisco Homero
Fernández van Raap, Marcela Beatriz
author_facet Saccone, Fabio Daniel
Rodríguez Torres, Claudia Elena
Sánchez, Francisco Homero
Fernández van Raap, Marcela Beatriz
author_sort Saccone, Fabio Daniel
title Hyperfine field and isomer shift evolution in hydrogenated Nd-Fe-B alloy
title_short Hyperfine field and isomer shift evolution in hydrogenated Nd-Fe-B alloy
title_full Hyperfine field and isomer shift evolution in hydrogenated Nd-Fe-B alloy
title_fullStr Hyperfine field and isomer shift evolution in hydrogenated Nd-Fe-B alloy
title_full_unstemmed Hyperfine field and isomer shift evolution in hydrogenated Nd-Fe-B alloy
title_sort hyperfine field and isomer shift evolution in hydrogenated nd-fe-b alloy
publishDate 2001
url http://sedici.unlp.edu.ar/handle/10915/142778
work_keys_str_mv AT sacconefabiodaniel hyperfinefieldandisomershiftevolutioninhydrogenatedndfeballoy
AT rodrigueztorresclaudiaelena hyperfinefieldandisomershiftevolutioninhydrogenatedndfeballoy
AT sanchezfranciscohomero hyperfinefieldandisomershiftevolutioninhydrogenatedndfeballoy
AT fernandezvanraapmarcelabeatriz hyperfinefieldandisomershiftevolutioninhydrogenatedndfeballoy
bdutipo_str Repositorios
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