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Magnetism
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Magnetocaloric Effect: Theory and Experiment in Concert
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Magnetocaloric Effect: Theory and Experiment in Concert

A special issue of Magnetism (ISSN 2673-8724).

Deadline for manuscript submissions: closed (31 October 2022) | Viewed by 14833

Special Issue Editors

Dr. Tarek Bachagha

E-Mail Website
Guest Editor
International Centre for Quantum and Molecular Structures, Physics Department, Shanghai University, Shanghai 200444, China
Interests: Materials Characterization; Magnetic shape memory alloys; Heusler alloys; Magnetic and mechanical properties; Corrosion; Thermal properties and fracture features of Metals
Special Issues, Collections and Topics in MDPI journals
Prof. Dr. Joan-Josep Suñol

E-Mail Website
Co-Guest Editor
Department of Physics, Campus Montilivi s/n, University of Girona, 17003 Girona, Spain
Interests: powder metallurgy; structural analysis; thermal analysis; mechanical alloying; nanocrystalline
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

The solid state materials with a considerable caloric effect are those that exhibit a first-order phase transition, which can be induced by various external stimuli, such as a magnetic field. Magnetocaloric effect (MCE) is heating or cooling of magnetic material when the applied magnetic field changes. At the heart of the MCEs lays coupling between the magnetic moments and external the magnetic field, and in some cases, the MCE involves structural transitions concomitant with magnetic transitions.

In this special issue, the articles should improve:

  1. Theoretical prediction of the magnetocaloric effect (thermodynamics, magnetism)
  2. Magnetocaloric Materials.
  3. Applications studies and development (actuators, sensors, magnetic refrigeration). Magnetic refrigeration based on the caloric effect of solid-state materials is supposed to be one of the most promising approaches.

The purpose of this special issue is to highlight the latest developments in the shaping of Magnetocaloric Materials. Researchers are therefore invited to present all their original scientific and technical articles of a theoretical and experimental nature on a wide range of materials and processes.

Dr. Tarek Bachagha
Prof. Dr. Joan-Josep Suñol
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. Magnetism is an international peer-reviewed open access quarterly 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 1000 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
  • Theoretical prediction
  • Magnetocaloric Materials
  • Magnetic refrigeration.

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Published Papers (4 papers)

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Research

16 pages, 723 KiB  
Article
Simulation of a Hybrid Thermoelectric-Magnetocaloric Refrigerator with a Magnetocaloric Material Having a First-Order Transition
by Elías Palacios, Jesús Francisco Beltrán and Ramón Burriel
Magnetism 2022, 2(4), 392-407; https://doi.org/10.3390/magnetism2040028 - 12 Dec 2022
Viewed by 2055
Abstract
A simple hybrid thermoelectric-magnetocaloric (TE-MC) system is analytically and numerically simulated using the working parameters of commercial Peltier cells and the properties of a material with a first-order and low-hysteresis magneto-structural phase transition as La(Fe,Mn,Si)13H1.65. The need for a [...] Read more.
A simple hybrid thermoelectric-magnetocaloric (TE-MC) system is analytically and numerically simulated using the working parameters of commercial Peltier cells and the properties of a material with a first-order and low-hysteresis magneto-structural phase transition as La(Fe,Mn,Si)13H1.65. The need for a new master equation of the heat diffusion is introduced to deal with these materials. The equation is solved by the Crank–Nicolson finite difference method. The results are compared with those corresponding to a pure TE system and a pure MC system with ideal thermal diodes. The MC material acts as a heat “elevator” to adapt its temperature to the cold or hot source making the TE system very efficient. The efficiency of the realistic hybrid system is improved by at least 30% over the pure Peltier system for the same current supply and is similar to the pure MC with ideal diodes for the same cooling power. Full article
(This article belongs to the Special Issue Magnetocaloric Effect: Theory and Experiment in Concert)
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18 pages, 7468 KiB  
Article
Tuning of the Magnetocaloric Properties of Mn5Ge3 Compound by Chemical Modification
by Karol Synoradzki, Krzysztof Urban, Przemysław Skokowski, Hubert Głowiński and Tomasz Toliński
Magnetism 2022, 2(1), 56-73; https://doi.org/10.3390/magnetism2010005 - 3 Mar 2022
Cited by 5 | Viewed by 2951
Abstract
The rare earth-free Mn5Ge3 compound shows magnetocaloric properties similar to those of pure Gd; therefore, it is a good candidate for magnetic refrigeration technology. In this work, we investigate the influence of chemical substitution on the crystal structure and the [...] Read more.
The rare earth-free Mn5Ge3 compound shows magnetocaloric properties similar to those of pure Gd; therefore, it is a good candidate for magnetic refrigeration technology. In this work, we investigate the influence of chemical substitution on the crystal structure and the magnetic, thermodynamic, and magnetocaloric properties of a polycrystalline Mn5Ge3 compound prepared by induction melting. For this purpose, we replaced 5% of the Mn with Cr or Co and 5% of the Ge with B or Al. The additional chemical elements were shown not to change the crystal structure of the parent compound (space group P63/mcm, No. 193). In the case of the magnetic properties, all samples remained ferromagnetic with the ordering temperature (TC) lower than for the original compound (TC = 295(1) K). The exception was the sample with B, where we observed an increase in TC by 3 K. The maximum value of the magnetic entropy change, |∆Sm|MAX (for a magnetic field change of 5 T), decreased from 7.1(1) for Mn5Ge3 to 6.2(1), 6.8(1), 4.8(1), and 5.8(1) J kg−1 K−1 for the alloys with B, Al, Cr, and Co, respectively. The adiabatic temperature change (∆Tad) (for a magnetic field change of 1 T) was determined from the specific heat measurements and was equal to 1.1(1), 1.2(1), 1.2(1), 0.8(1), and 0.8(1) K for Mn5Ge3, Mn5Ge2.85B0.15, Mn5Ge2.85Al0.15, Mn4.75Cr0.25Ge3, and Mn4.75Co0.25Ge3, respectively. The obtained data were compared with those from the literature. It was found that the substitution allowed for tuning of the ordering temperature in a wide temperature range. At the same time, the reduction in the magnetocaloric parameters’ values was relatively small. Therefore, the produced Mn5Ge3-based alloys allow for the expansion of the operation temperature range of the parent compound as a magnetocaloric material. Full article
(This article belongs to the Special Issue Magnetocaloric Effect: Theory and Experiment in Concert)
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21 pages, 2314 KiB  
Article
An Analytical Approach for Computing the Coefficient of Refrigeration Performance in Giant Inverse Magnetocaloric Materials
by Nickolaus M. Bruno and Matthew R. Phillips
Magnetism 2022, 2(1), 10-30; https://doi.org/10.3390/magnetism2010002 - 13 Jan 2022
Cited by 3 | Viewed by 3431
Abstract
An analytical approach for computing the coefficient of refrigeration performance (CRP) was described for materials that exhibited a giant inverse magnetocaloric effect (MCE), and their governing thermodynamics were reviewed. The approach defines the magnetic work input using thermodynamic relationships rather than isothermal magnetization [...] Read more.
An analytical approach for computing the coefficient of refrigeration performance (CRP) was described for materials that exhibited a giant inverse magnetocaloric effect (MCE), and their governing thermodynamics were reviewed. The approach defines the magnetic work input using thermodynamic relationships rather than isothermal magnetization data discretized from the literature. The CRP was computed for only cyclically reversible temperature and entropy changes in materials that exhibited thermal hysteresis by placing a limit on their operating temperature in a thermodynamic cycle. The analytical CRP serves to link meaningful material properties in first-order MCE refrigerants to their potential work and efficiency and can be employed as a metric to compare the behaviors of dissimilar alloy compositions or for materials design. We found that an optimum in the CRP may exist that depends on the applied field level and Clausius–Clapeyron (CC) slope. Moreover, through a large literature review of NiMn-based materials, we note that NiMn(In/Sn) alloys offer the most promising materials properties for applications within the bounds of the developed framework. Full article
(This article belongs to the Special Issue Magnetocaloric Effect: Theory and Experiment in Concert)
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15 pages, 4788 KiB  
Article
Ferroelectric and Dielectric Properties of Strontium Titanate Doped with Barium
by Ahmed Maher Henaish, Maha Mostafa, Ilya Weinstein, Osama Hemeda and Basant Salem
Magnetism 2021, 1(1), 22-36; https://doi.org/10.3390/magnetism1010003 - 11 Nov 2021
Cited by 14 | Viewed by 4434
Abstract
Ferroelectric samples Sr1−xBaxTiO3 (BST), where x = 0, 0.2, 0.4, 0.6, 0.8 and 1, were prepared using the tartrate precursor method and annealed at 1200 °C for 2 h. X-ray diffraction, “XRD”, pattern analysis verified the structure phase. [...] Read more.
Ferroelectric samples Sr1−xBaxTiO3 (BST), where x = 0, 0.2, 0.4, 0.6, 0.8 and 1, were prepared using the tartrate precursor method and annealed at 1200 °C for 2 h. X-ray diffraction, “XRD”, pattern analysis verified the structure phase. The crystallite size of the SrTiO3 phase was calculated to be 83.6 nm, and for the TiO2 phase it was 72.25 nm. The TEM images showed that the crystallites were agglomerated, due to their nanosize nature. The AC resistivity was measured as temperature dependence with different frequencies 1 kHz and 10 kHz. The resistivity was decreased by raising the frequency. The dielectric properties were measured as the temperature dependence at two frequencies, 1 kHz and 10 kHz. The maximum amount of dielectric constant corresponded to the Curie temperature and the transformation from ferroelectric to paraelectric at 1 kHz was sharp at 10 kHz. Polarization–electric field hysteresis loops for BST samples were measured using a Sawer–Tawer modified circuit. It was shown that the polarization decreased with increasing temperature for all samples. Full article
(This article belongs to the Special Issue Magnetocaloric Effect: Theory and Experiment in Concert)
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