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Artículo
The effect of distributed exchange parameters on magnetocaloric refrigeration capacity in amorphous and nanocomposite materials
dc.creator | Ipus Bados, Jhon Jairo | |
dc.creator | Jones, N. J. | |
dc.creator | Ucar, H. | |
dc.creator | McHenry, M. E. | |
dc.creator | Laughlin, D. E. | |
dc.date.accessioned | 2016-02-02T08:18:13Z | |
dc.date.available | 2016-02-02T08:18:13Z | |
dc.date.issued | 2012-02-17 | |
dc.identifier.issn | 0021-8979 | es |
dc.identifier.uri | http://hdl.handle.net/11441/33786 | |
dc.description.abstract | The temperature dependent magnetization of nanocomposite alloys has been fit with a modified Handrich-Kobe equation with an asymmetric exchange fluctuation parameter combined with the Arrott-Noakes equation. The two equations of state are combined to calculate the entropy change in the magnetocaloric effect associated with the ferromagnetic to paramagnetic phase transformation. The complete fit for the M(T) of (Fe70Ni30)88Zr7B4Cu nanocomposite powder is accomplished by combining the two theories. We investigate the broadening of the second-order transition arising from asymmetric exchange parameters and resulting from the fluctuations of interatomic spacing found in an amorphous matrix and the asymmetric dependence of exchange energy on interatomic spacing. The magnetic entropy curve revealed extra broadening with a refrigeration capacity (RC) value of 135 J/kg at 5 T, which is comparable to (Fe76Cr8-xMoxCu1B15) ribbons, which have a RC value of 180 J/kg for the same applied field. Broadening of the magnetic entropy can lead to larger RC values and a wider working temperature range, making nanocomposite alloys promising for magnetocaloric applications. | es |
dc.format | application/pdf | es |
dc.language.iso | eng | es |
dc.publisher | AIP Publishing | es |
dc.relation.ispartof | Journal of Applied Physics, 111, 07A334 | es |
dc.rights | Attribution-NonCommercial-NoDerivatives 4.0 Internacional | * |
dc.rights.uri | http://creativecommons.org/licenses/by-nc-nd/4.0/ | * |
dc.subject | Amorphous matrices | es |
dc.subject | Applied field | es |
dc.subject | Entropy changes | es |
dc.subject | Exchange energy | es |
dc.subject | Exchange parameters | es |
dc.subject | Interatomic spacing | es |
dc.subject | Magnetic entropy | es |
dc.subject | Magnetocaloric | es |
dc.subject | Nano-composite powders | es |
dc.subject | Nanocomposite alloys | es |
dc.subject | Refrigeration capacity | es |
dc.subject | Second order transition | es |
dc.subject | Temperature dependent | es |
dc.subject | Working temperatures | es |
dc.subject | Entropy | es |
dc.subject | Magnetocaloric effects | es |
dc.subject | Nanocomposites | es |
dc.subject | Paramagnetism | es |
dc.subject | Refrigeration | es |
dc.subject | Zirconium | es |
dc.subject | Magnetic refrigeration | es |
dc.title | The effect of distributed exchange parameters on magnetocaloric refrigeration capacity in amorphous and nanocomposite materials | es |
dc.type | info:eu-repo/semantics/article | es |
dc.type.version | info:eu-repo/semantics/publishedVersion | es |
dc.rights.accessRights | info:eu-repo/semantics/openAccess | es |
dc.contributor.affiliation | Universidad de Sevilla. Departamento de Física de la Materia Condensada | es |
dc.relation.publisherversion | 10.1063/1.3679456 | es |
dc.identifier.doi | http://dx.doi.org/10.1063/1.3679456 | es |
dc.identifier.idus | https://idus.us.es/xmlui/handle/11441/33786 |
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