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Magnetochemistry
Special Issues
Magnetocaloric and Electrocaloric Materials for Solid State Refrigeration
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Magnetocaloric and Electrocaloric Materials for Solid State Refrigeration

A special issue of Magnetochemistry (ISSN 2312-7481).

Deadline for manuscript submissions: closed (31 July 2017) | Viewed by 15683

Special Issue Editor

Dr. Adriana Greco

E-Mail Website
Guest Editor
Department of Industrial Engineering (DII), University of Naples Federico II, 80138 Naples, Italy
Interests: caloric cooling; vapor compression plants; refrigerant fluids; convective boiling; nanofluids; earth–air heat exchangers; renewable energy systems
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Worldwide, about 17% of the overall energy consumption originates from refrigeration. Most of the refrigeration applications are based on vapor compression plants. They are characterized by the use of environmentally harmful refrigerants. Therefore, the scientific community has devoted its attention toward non-vapor-compression technologies for refrigeration and air conditioning. Between these technologies, solid-state cooling methods promise high system efficiency. When the refrigerant is solid, it has essentially zero vapor pressure and, therefore, it is ecological since it has no direct Ozone Depletion Potential (ODP) and zero direct Global Warming Potential (GWP). In this class, in the field of small-scale refrigerators, there are magnetocaloric and electrocaloric refrigeration systems. Magnetic refrigeration is based on the Magneto-Caloric Effect (MCE), whereas electrocaloric refrigeration is based on the ElectroCaloric Effect (ECE). Similar principles support the physics of the MCE and ECE. MCE and ECE are physical phenomena found in materials with dielectric properties (Electrocaloric Materials (EM)) or with magnetic properties (Magnetocaloric Materials (MM)). Active Magnetic Regenerator/Active Electrocaloric Regenerator (AMR/AER) is the core of an active regenerative thermodynamic cycle. The performances of an AMR/AER refrigerator are mostly influenced by the particular solid materials employed.

The main goal of this Special Issue of Magnetochemistry is to analyze Magnetocaloric and Electrocaloric materials from both theoretical and experimental points of view. Therefore, all the papers focusing on MM and EM characterization, with respect to electrical and magnetic properties, are welcomed, together with papers based on the evaluation of the energetic performances of AMR or AER plants.

Prof. Dr. Adriana Greco
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 2200 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

  • Solid state refrigeration
  • Solid state physics
  • Magnetic refrigeration
  • Electrocaloric refrigeration
  • Magnetocaloric effect
  • Electrocaloric effect
  • Magnetic Materials
  • Electrocaloric Materials
  • AMR
  • AER
  • Energetic performances
  • COP
  • Refrigerant power
  • Temperature span
  • Numerical models
  • Experimental tests
  • Characterization of materials

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Published Papers (3 papers)

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3768 KiB  
Article
The Effect of a Multiphase Microstructure on the Inverse Magnetocaloric Effect in Ni–Mn–Cr–Sn Metamagnetic Heusler Alloys
by Paweł Czaja, Robert Chulist, Antoni Żywczak, Lukasz Hawelek and Janusz Przewoźnik
Magnetochemistry 2017, 3(3), 24; https://doi.org/10.3390/magnetochemistry3030024 - 6 Jul 2017
Cited by 8 | Viewed by 4341
Abstract
Two Ni–Mn–Sn alloys substituted with 0.5 and 1 at.% Cr have been studied. The first alloy shows an average composition of Ni49.6Mn37.3Cr0.7Sn12.4 (e/a = 8.107), whereas the second has a multiphase microstructure with the matrix [...] Read more.
Two Ni–Mn–Sn alloys substituted with 0.5 and 1 at.% Cr have been studied. The first alloy shows an average composition of Ni49.6Mn37.3Cr0.7Sn12.4 (e/a = 8.107), whereas the second has a multiphase microstructure with the matrix phase of an average Ni52.4Mn32.7Cr1Sn14 composition (e/a = 8.146). Both alloys undergo a reversible martensitic phase transformation. The Ni49.6Mn37.3Cr0.7Sn12.4 alloy transforms to the martensite phase at 239 K and, under the magnetic field change of μ0·ΔH = 1.5 T, gives the magnetic entropy change equal to 7.6 J/kg·K. This amounts to a refrigerant capacity in the order of 48.6 J/kg, reducible by 29.8% due to hysteresis loss. On the other hand, the alloy with a multiphase microstructure undergoes the martensitic phase transformation at 223 K with the magnetic entropy change of 1.7 J/kg·K (1 T). Although the latter spreads over a broader temperature window in the multiphase alloy, it gives much smaller refrigerant capacity of 16.2 J/kg when compared to Ni49.6Mn37.3Cr0.7Sn12.4. The average hysteresis loss for a field change of 1.5 T in the multiphase alloy is 2.7 J/kg, reducing the effective refrigerant capacity by 16.7%. These results illustrate that the key to gaining a large effective refrigerant capacity is the synergy between the magnitude of the magnetic entropy change and its broad temperature dependence. Full article
(This article belongs to the Special Issue Magnetocaloric and Electrocaloric Materials for Solid State Refrigeration)
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1500 KiB  
Article
Magnetocaloric Properties of (MnFeRu)2(PSi) as Magnetic Refrigerants near Room Temperature
by Takayuki Ohnishi, Kei Soejima, Keiichiro Yamashita and Hirofumi Wada
Magnetochemistry 2017, 3(1), 6; https://doi.org/10.3390/magnetochemistry3010006 - 8 Feb 2017
Cited by 14 | Viewed by 4455
Abstract
We have scaled up the production process of magnetic refrigerants near room temperature. The Mn2−yFey−xRuxP1−zSiz compounds with 0.03 ≤ x ≤ 0.16, y ≈ 0.75, and z ≈ 0.55 were [...] Read more.
We have scaled up the production process of magnetic refrigerants near room temperature. The Mn2−yFey−xRuxP1−zSiz compounds with 0.03 ≤ x ≤ 0.16, y ≈ 0.75, and z ≈ 0.55 were synthesized and their magnetocaloric properties were examined. By changing the compositions and the annealing temperature, the Curie temperature was tuned between 275 and 315 K with 2~3 K steps. All the compounds underwent a first-order magnetic transition accompanied by thermal hysteresis of less than 2 K. The compounds showed excellent magnetocaloric properties: the magnetic entropy change was more than 10 J/K·kg and the refrigerant capacity was about 115 J/kg in a field change of 1.5 T. The detailed instructions to synthesize high-performance (MnFe)2PSi materials are given. Full article
(This article belongs to the Special Issue Magnetocaloric and Electrocaloric Materials for Solid State Refrigeration)
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5306 KiB  
Article
Large Inverse Magnetocaloric Effects and Giant Magnetoresistance in Ni-Mn-Cr-Sn Heusler Alloys
by Sudip Pandey, Abdiel Quetz, Anil Aryal, Igor Dubenko, Dipanjan Mazumdar, Shane Stadler and Naushad Ali
Magnetochemistry 2017, 3(1), 3; https://doi.org/10.3390/magnetochemistry3010003 - 5 Jan 2017
Cited by 27 | Viewed by 6083
Abstract
The magnetostructural transitions, magnetocaloric effects, and magnetoresistance properties of Ni45Mn43CrSn11 Heusler alloys were investigated using X-ray diffraction (XRD), field-dependent magnetization, and electrical resistivity measurements. A large inverse and direct magnetocaloric effect has been observed in Ni45Mn [...] Read more.
The magnetostructural transitions, magnetocaloric effects, and magnetoresistance properties of Ni45Mn43CrSn11 Heusler alloys were investigated using X-ray diffraction (XRD), field-dependent magnetization, and electrical resistivity measurements. A large inverse and direct magnetocaloric effect has been observed in Ni45Mn43CrSn11 across the martensitic and Curie transition temperature, respectively. The values of the latent heat (L = 15.5 J/g) and corresponding magnetic (ΔSM) and total (∆ST) entropy changes (ΔSM = 35 J/kg·K for ΔH = 5T and ∆ST = 39.7 J/kg·K) have been evaluated using magnetic and differential scanning calorimetry (DSC) measurements, respectively. A substantial jump in resistivity was observed across the martensitic transformation. A large negative magnetoresistance (~67%) was obtained at the magnetostructural transition for a field change of 5 T. The roles of the magnetic and structural changes on the transition temperatures and the potential application of Ni45Mn43CrSn11 Heusler alloys for refrigerator technology are discussed. Full article
(This article belongs to the Special Issue Magnetocaloric and Electrocaloric Materials for Solid State Refrigeration)
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