Synthesis and magnetocaloric characterization of rapidly solidified ErMn2 melt-spun ribbons

"We have fabricated melt-spun ribbons of nominal composition ErMn2 and studied their phase constitution and magnetocaloric (MC) properties by X-ray diffraction, scanning electron microscopy (SEM), magnetization and heat capacity measurements. The major phase formed shows the MgZn2-type hexagona...

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Detalhes bibliográficos
Autores: JOSE LUIS SANCHEZ LLAMAZARES, Pablos Jesús Ibarra Gaytán, CESAR FIDEL SANCHEZ VALDES, Pablo Álvarez Alonso, ARMANDO DAVID MARTINEZ INIESTA
Tipo de documento: artigo
Estado:Versión enviada para evaluación y publicación
Data de publicação:2017
País:México
Recursos:Instituto Potosino de Investigación Científica y Tecnológica
Repositório:Repositorio Institucional del IPICYT
OAI Identifier:oai:ipicyt.repositorioinstitucional.mx:1010/2018
Acesso em linha:http://ipicyt.repositorioinstitucional.mx/jspui/handle/1010/2018
Access Level:Acceso aberto
Palavra-chave:info:eu-repo/classification/Autor/ErMn2 Laves phase
info:eu-repo/classification/Autor/Melt spun ribbons
info:eu-repo/classification/Autor/Magnetocaloric effect
info:eu-repo/classification/Autor/Magnetic entropy change
info:eu-repo/classification/Autor/Adiabatic temperature change
info:eu-repo/classification/cti/2
info:eu-repo/classification/cti/23
Descrição
Resumo:"We have fabricated melt-spun ribbons of nominal composition ErMn2 and studied their phase constitution and magnetocaloric (MC) properties by X-ray diffraction, scanning electron microscopy (SEM), magnetization and heat capacity measurements. The major phase formed shows the MgZn2-type hexagonal structure (C14-type); however, both XRD and SEM analyses revealed the formation of impurity phases (i.e., Er6Mn23 and ErMn12). Ribbons exhibit a saturation magnetization of 149 Am2kg?1 at 2 K and a Curie temperature of TC = 15 K. A field-induced metamagnetic transition at very low critical magnetic fields was observed below 8 K that leads to a change of sign in the magnetic entropy change ?SM below this temperature (?SMpeak = 2.5 Jkg?1K?1 at 2 K and 5 T). For a magnetic field change of 5 T (2 T) applied along the ribbon length, the samples show a large peak value of the magnetic entropy change ?SMpeak of ?20.5 (?10.8) Jkg?1K?1, a full-width at half-maximum ?TFWHM for the ?SM(T) curve of 20 (12) K, and a maximum adiabatic temperature change ?Tadmax of 7.4 (3.6) K. The obtained results are compared with the reported in literature by other authors for bulk alloys."

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