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Magnetocaloric Effect: Theory, Materials and Applications

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A special issue of Magnetochemistry (ISSN 2312-7481). This special issue belongs to the section "Magnetic Materials".

Deadline for manuscript submissions: closed (30 March 2022) | Viewed by 5988

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Special Issue Editor

Prof. Dr. Joan-Josep Suñol

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Guest Editor

Composite Campus- Materials and Thermodynamics labs, University of Girona, 17003 Girona, Spain
Interests: magnetic properties; soft magnetic materials; magnetocaloric materials, microstructure
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

The magnetocaloric effect (MCE) is due to the temperature change provoked by the application of a magnetic field. In this special chapter, the articles should improve:

theoretical scientific knowledge (thermodynamics, magnetism)
simulation studies (ab initio, Montecarlo)
materials with high functional properties
applications studies and development/simulation of specific devices (actuators, sensors, energy). As an example, magnetic refrigeration technology has brought an eco-friendly alternative to the conventional gas compression (CGC) technique.

This special issue is open to new ideas and approaches, as well to review articles.

Dr. Joan-Josep Suñol Martinez
Guest Editor

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Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Magnetochemistry is an international peer-reviewed open access monthly journal published by MDPI.

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Keywords

magnetocaloric effect
magnetocaloric theory
magnetocaloric materials
magnetic refrigeration
magnetocaloric devices

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Published Papers (2 papers)

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Research

14 pages, 4921 KiB

Open AccessFeature PaperArticle

Structure, Microstructure, and Magnetic Properties of Melt Spun Ni₅₀Mn₅₀_−xIn_x Ribbons

by Karima Dadda, Safia Alleg, Joan Saurina, Lluïsa Escoda and Joan-Josep Suñol

Magnetochemistry 2021, 7(5), 63; https://doi.org/10.3390/magnetochemistry7050063 - 7 May 2021

Cited by 3 | Viewed by 2104

Abstract

Structural, microstructural, and magnetic properties of Heusler Ni₅₀Mn_50−xIn_x (x = 5 and 10) ribbons have been investigated by X-ray diffraction (XRD), scanning electron microscopy (SEM) coupled with energy dispersive X-ray spectroscopy (EDS), differential scanning calorimetry (DSC), and vibrating sample magnetometry (VSM). The as quenched Ni₅₀Mn₄₅In₅ ribbons exhibit a mixture of monoclinic 14M (a = 4.329(3) Å, b = 5.530(3) Å, and c = 28.916(3) Å), and tetragonal L1₀ (a = b = 3.533(3) Å, and c = 7.522(3) Å) martensite structures, while Ni₅₀Mn₄₀In₁₀ ribbons display a single monoclinic 14M phase (a = 4.262(3) Å, b = 5.692(3) Å, and c = 29.276(3) Å). After three heating/cooling cycles, in the temperature range of 303–873 K, the Rietveld refinement of the XRD patterns revealed the presence of a single 14M martensite for Ni50Mn45In5 ribbons, and a mixture of cubic L2₁ (31%) and 14M (69%) phases for Ni₅₀Mn₄₀In₁₀ ribbons. The characteristic temperatures of the martensitic transition (A_start, A_finish, M_start, and M_finish), the thermal hysteresis temperature width, and the equilibrium temperature decreased with increasing indium content and heating cycles. The samples show a paramagnetic like behavior in the as quenched state, and a ferromagnetic like behavior after the third heating/cooling cycle. Full article

(This article belongs to the Special Issue Magnetocaloric Effect: Theory, Materials and Applications)

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10 pages, 12040 KiB

Open AccessFeature PaperArticle

Reversibility of the Magnetocaloric Effect in the Bean-Rodbell Model

by Luis M. Moreno-Ramírez and Victorino Franco

Magnetochemistry 2021, 7(5), 60; https://doi.org/10.3390/magnetochemistry7050060 - 5 May 2021

Cited by 8 | Viewed by 2658

Abstract

The applicability of magnetocaloric materials is limited by irreversibility. In this work, we evaluate the reversible magnetocaloric response associated with magnetoelastic transitions in the framework of the Bean-Rodbell model. This model allows the description of both second- and first-order magnetoelastic transitions by the [...] Read more.

η

parameter (

η < 1

for second-order and

η > 1

for first-order ones). The response is quantified via the Temperature-averaged Entropy Change (

T E C

), which has been shown to be an easy and effective figure of merit for magnetocaloric materials. A strong magnetic field dependence of

T E C

is found for first-order transitions, having a significant increase when the magnetic field is large enough to overcome the thermal hysteresis of the material observed at zero field. This field value, as well as the magnetic field evolution of the transition temperature, strongly depend on the atomic magnetic moment of the material. For a moderate magnetic field change of 2 T, first-order transitions with

η \approx 1.3 - 1.8

have better

T E C

than those corresponding to stronger first-order transitions and even second-order ones. Full article