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Type: Artigo
Title: Magnetocaloric effect investigation in the ferromagnetic Eu2CuSi3 compound
Author: Silva, M. G.
Paula, V. G. de
Santos, A. O. dos
Coelho, A. A.
Cardoso, L. P.
Silva, L. M. da
Abstract: Here, it is reported the study of the structural, magnetic properties and magnetocaloric effect (MCE) of the Eu2CuSi3 compound. Polycrystalline Eu2CuSi3 compound with AlB2-type derived hexagonal structure was successfully synthesized by arc-melting method. Magnetic measurements indicate a second-order ferromagnetic (FM) phase transition below 40 K. The effective magnetic moment of Eu is reduced compared with divalent free ion, indicating a compensation of Eu magnetic moment. Spin reorientation induce negative magnetocaloric effect below Curie temperature. The values of full width half-maximum of -Delta S-M peak (delta T-FWHM = 35 K) and maximum value of entropy change (- Delta S-M(Mix) similar to 9.5 J/kg K) for mu(0)Delta H = 6 T strongly contribute to improve the relative cooling power (RCP similar to 332 J/kg) of Eu2CuSi3 compound. As observed, delta T-FWHM value is sensibly wider than the usual values observed for first and second order magnetic phase transition compounds. Then, - Delta S-M(max) and delta T-FWHM values as well as the neglected magnetic hysteresis that were obtained for Eu2CuSi3 have shown features as a desirable second order magnetic phase transition compound for low temperature magnetic refrigeration.
Subject: Intermetálicos de terras raras
Propriedades magnéticas
Materiais ferromagnéticos
Rare earth intermetallic
Magnetic properties
Ferromagnetic materials
Country: Reino Unido
Editor: Elsevier
Rights: fechado
Identifier DOI: 10.1016/j.intermet.2017.04.013
Date Issue: 2017
Appears in Collections:IFGW - Artigos e Outros Documentos

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