Critical behavior, magnetic and magnetocaloric properties of meltspun Ni50Mn35Sn15 ribbons
Microstructure, structural and magnetic phase transitions of the melt spun Ni50Mn35Sn15ribbons have been examined by means of scanning electron microscopy, X-ray diffraction, differential scanning calorimetry and magnetic measurements. The melt spun ribbons exhibit a single phase cubic L21austenite...
| Autores: | , , , , , , |
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| Tipo de recurso: | artículo |
| Estado: | Versión publicada |
| Fecha de publicación: | 2018 |
| País: | España |
| Institución: | Varias* (Consorci de Biblioteques Universitáries de Catalunya, Centre de Serveis Científics i Acadèmics de Catalunya) |
| Repositorio: | Recercat. Dipósit de la Recerca de Catalunya |
| OAI Identifier: | oai:recercat.cat:10256/15873 |
| Acceso en línea: | http://hdl.handle.net/10256/15873 |
| Access Level: | acceso embargado |
| Palabra clave: | Metalls de transició -- Aliatges Transition metals -- Alloys Estany -- Propietats magnètiques Tin -- Magnetic properties Manganès -- Propietats magnètiques Manganese -- Magnetic properties Níquel -- Propietats magnètiques Nickel -- Magnetic properties Microestructura Microstructure |
| Sumario: | Microstructure, structural and magnetic phase transitions of the melt spun Ni50Mn35Sn15ribbons have been examined by means of scanning electron microscopy, X-ray diffraction, differential scanning calorimetry and magnetic measurements. The melt spun ribbons exhibit a single phase cubic L21austenite structure at room temperature with a space group Fm−3m, and lattice parameter a = 5.956 Å. The DSC results reveal the first order reverse and forward martensitic transition (Ms= 147.4 K, Mf= 133.7 K, As= 155 K and Af= 171 K) with a thermal hysteresis of about 21.3 K around the martensitic transition between heating and cooling. The thermomagnetic measurements show that the melt spun ribbons undergo a second order magnetic transition at a Curie temperature TC= 310 K and a first order martensitic transition at TM= 160 K. The critical behavior associated with the magnetic phase transition has been investigated through the isothermal magnetization measurements around TC. The critical exponents have been estimated by several methods such as the modified Arrott plots, Kouvel-Fisher method and critical isothermal analysis. The critical exponents values β=0.456, γ=0.88 and δ=2.929 are close to those predicted from the mean field model revealing a dominated long-range order of magnetic interactions. For an applied magnetic field of 5 T, the maximum magnetic entropy change (ΔSMmax) and the relative cooling power (RCP) values around TCare of about 2.105 J/kg.K and 132.5 J/kg, respectively. The melt-spun Ni50Mn35Sn15alloy is a good candidate for magnetic refrigeration near room temperature |
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