Magnetic entropy table-like shape in RNi2 composites for cryogenic refrigeration
"We have investigated the magnetocaloric (MC) effect in a two-phase composite based on melt-spun ribbons of the intermetallic DyNi2 and TbNi2 Laves phases. The temperature dependence of the isothermal magnetic entropy change, Delta S-M(T), has been calculated for the biphasic system x(DyNi2) +...
| Autores: | , , , , , |
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| Tipo de recurso: | artículo |
| Estado: | Versión publicada |
| Fecha de publicación: | 2015 |
| País: | México |
| Institución: | Instituto Potosino de Investigación Científica y Tecnológica |
| Repositorio: | Repositorio Institucional del IPICYT |
| Idioma: | inglés |
| OAI Identifier: | oai:ipicyt.repositorioinstitucional.mx:1010/1162 |
| Acceso en línea: | http://ipicyt.repositorioinstitucional.mx/jspui/handle/1010/1162 |
| Access Level: | acceso abierto |
| Palabra clave: | info:eu-repo/classification/cti/1 info:eu-repo/classification/cti/22 |
| Sumario: | "We have investigated the magnetocaloric (MC) effect in a two-phase composite based on melt-spun ribbons of the intermetallic DyNi2 and TbNi2 Laves phases. The temperature dependence of the isothermal magnetic entropy change, Delta S-M(T), has been calculated for the biphasic system x(DyNi2) + y(TbNi2) with 0< x < 1 (i. e., y - 1 - x). The optimum MC properties, i. e., a Delta S-M(T) curve with table-like shape, has been found in the temperature interval of 18-44K for the composite with x = 0.4 and for values of the magnetic field change mu(o)Delta H - 2 and 5 T, in good agreement with the experimental data. The refrigerant capacity, RC, reaches 221(526) J kg(-1) with a temperature span delta T-FWHM of 32(41) K for mu(o)Delta H of 2(5) T, thus improving the values obtained for the individual RNi2 ribbons. Our findings constitute a good starting point to stimulate the search for new composites with enhanced MC properties at cryogenic temperatures." |
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