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On tuning the magnetocaloric effect in Ni-Mn-In Heusler alloy ribbons with thermal treatment

An improvement of the magnetocaloric response in Ni 50.0Mn 35.5In 14.5 Heusler alloy ribbons after annealing is reported. Furthermore, the phase of the annealed sample at room temperature can be austenite or martensite depending on the annealing conditions. Short-time thermal treatments during 10 min at temperatures of 1048 and 1073 K enhance both the maximum values of structural and magnetic entropy changes (ΔS Mpk), and the refrigerant capacity (RC) of the as-spun sample. For a magnetic field value of 3 T, an enhancement in ΔS Mpk of ∼175% and ∼40%, and in RC of ∼25% and ∼20%, have been obtained in the temperature ranges where these structural and magnetic entropy changes take place, respectively. In addition, the ΔS Mpk values have been calculated using both the Clausius-Clapeyron equation and the Maxwell relation, showing a good agreement between them in the main existing first-order phase transitions

Authors thank to Spanish MICINN for financial support under MAT2009-13108-C02-01-02 and MAT2010-20798-C05-04

© Journal of Alloys and Compounds, 2012, vol. 545, p. 216-221

Elsevier

Author: Caballero-Flores, R.
Sánchez, T.
Rosa, W. O.
García Fernández, Javier
González-Legarreta, L.
Serantes, D.
Prida, V.M.
Escoda i Acero, Ma. Lluïsa
Suñol Martínez, Joan Josep
Hernando, Blanca
Date: 2012 December 25
Abstract: An improvement of the magnetocaloric response in Ni 50.0Mn 35.5In 14.5 Heusler alloy ribbons after annealing is reported. Furthermore, the phase of the annealed sample at room temperature can be austenite or martensite depending on the annealing conditions. Short-time thermal treatments during 10 min at temperatures of 1048 and 1073 K enhance both the maximum values of structural and magnetic entropy changes (ΔS Mpk), and the refrigerant capacity (RC) of the as-spun sample. For a magnetic field value of 3 T, an enhancement in ΔS Mpk of ∼175% and ∼40%, and in RC of ∼25% and ∼20%, have been obtained in the temperature ranges where these structural and magnetic entropy changes take place, respectively. In addition, the ΔS Mpk values have been calculated using both the Clausius-Clapeyron equation and the Maxwell relation, showing a good agreement between them in the main existing first-order phase transitions
Authors thank to Spanish MICINN for financial support under MAT2009-13108-C02-01-02 and MAT2010-20798-C05-04
Format: application/pdf
ISSN: 0925-8388
Document access: http://hdl.handle.net/10256/12835
Language: eng
Publisher: Elsevier
Collection: MICINN/PN2010-2013/MAT2009-13108-C02-02
Reproducció digital del document publicat a: http://dx.doi.org/10.1016/j.jallcom.2012.07.151
Articles publicats (D-F)
Is part of: © Journal of Alloys and Compounds, 2012, vol. 545, p. 216-221
Rights: Tots els drets reservats
Subject: Metalls de transició -- Aliatges
Transition metals -- Alloys
Title: On tuning the magnetocaloric effect in Ni-Mn-In Heusler alloy ribbons with thermal treatment
Type: info:eu-repo/semantics/article
Repository: DUGiDocs

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