Low field magnetocaloric effect in bulk and ribbon alloy La(Fe^sub 0.88^Si^sub 0.12^)^sub 13

Low-field magnetocaloric effect occurred in itinerant metamagnetic materials is at core for magnetic cooling application. This works reports the magnetocaloric responses obtained at 1.35 T for the silicon-doped iron-based binary alloy La(Fe0.88Si0.12)13 in the bulk and ribbon form. Both samples poss...

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Bibliographic Details
Published inPhysica. B, Condensed matter Vol. 532; p. 115
Main Authors Vuong, Van-Hiep, Do-Thi, Kim-Anh, Nguyen, Duy-Thien, Nguyen, Quang-Hoa, Hoang, Nam-Nhat
Format Journal Article
LanguageEnglish
Published Amsterdam Elsevier BV 01.03.2018
Subjects
Alloys
Binary alloys
Bulk sampling
Cooling effects
Crystal lattices
Crystallization
Curie temperature
Ferrous alloys
Lattice parameters
Magnetic cooling
Magnetic fields
Magnetism
Maximum entropy
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Summary:Low-field magnetocaloric effect occurred in itinerant metamagnetic materials is at core for magnetic cooling application. This works reports the magnetocaloric responses obtained at 1.35 T for the silicon-doped iron-based binary alloy La(Fe0.88Si0.12)13 in the bulk and ribbon form. Both samples possess a same symmetry but with different crystallite sizes and lattice parameters. The ribbon sample shows a larger maximum entropy change (nearly 8.5 times larger) and a higher Curie temperature (5 K higher) in comparison with that of the bulk sample. The obtained relative cooling power for the ribbon is also larger and very promising for application (RCP = 153 J/kg versus 25.2 J/kg for the bulk). The origin of the effect observed is assigned to the occurrence of negative magnetovolume effect in the ribbon structure with limit crystallization, caused by rapid cooling process at the preparation, which induced smaller crystallite size and large lattice constant at the overall weaker local crystal field.
ISSN:0921-4526
1873-2135