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Magnetochemistry
Special Issues
Magnetocaloric Effect: Theory, Materials and Applications
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Magnetocaloric Effect: Theory, Materials and Applications

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 4928

Special Issue Editor

Prof. Dr. Joan-Josep Suñol

E-Mail Website
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:

  1. theoretical scientific knowledge (thermodynamics, magnetism)
  2. simulation studies (ab initio, Montecarlo)
  3. materials with high functional properties
  4. 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

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

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.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2700 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • magnetocaloric effect
  • magnetocaloric theory
  • magnetocaloric materials
  • magnetic refrigeration
  • magnetocaloric devices

Published Papers (2 papers)

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Research

14 pages, 4921 KiB  
Article
Structure, Microstructure, and Magnetic Properties of Melt Spun Ni50Mn50−xInx Ribbons
by Karima Dadda, Safia Alleg, Joan Saurina, Lluïsa Escoda and Joan-Josep Suñol
Magnetochemistry 2021, 7(5), 63; https://0-doi-org.brum.beds.ac.uk/10.3390/magnetochemistry7050063 - 07 May 2021
Cited by 2 | Viewed by 1738
Abstract
Structural, microstructural, and magnetic properties of Heusler Ni50Mn50−xInx (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 [...] Read more.
Structural, microstructural, and magnetic properties of Heusler Ni50Mn50−xInx (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 (Astart, Afinish, Mstart, and Mfinish), 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  
Article
Reversibility of the Magnetocaloric Effect in the Bean-Rodbell Model
by Luis M. Moreno-Ramírez and Victorino Franco
Magnetochemistry 2021, 7(5), 60; https://0-doi-org.brum.beds.ac.uk/10.3390/magnetochemistry7050060 - 05 May 2021
Cited by 7 | Viewed by 2290
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.
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 modification of the η parameter (η<1 for second-order and η>1 for first-order ones). The response is quantified via the Temperature-averaged Entropy Change (TEC), which has been shown to be an easy and effective figure of merit for magnetocaloric materials. A strong magnetic field dependence of TEC 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≈1.3−1.8 have better TEC than those corresponding to stronger first-order transitions and even second-order ones. Full article
(This article belongs to the Special Issue Magnetocaloric Effect: Theory, Materials and Applications)
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