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Crystals
Special Issues
Magnetocaloric Effect and Giant Negative Thermal Expansion
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Magnetocaloric Effect and Giant Negative Thermal Expansion

A special issue of Crystals (ISSN 2073-4352). This special issue belongs to the section "Inorganic Crystalline Materials".

Deadline for manuscript submissions: closed (10 August 2021) | Viewed by 4279

Special Issue Editors

Prof. Dr. Jiantao Wang

E-Mail Website
Guest Editor
1. Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
2. School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 100049, China
Interests: magneto-structural phase transition; high-pressure phase transition; surface reconstruction; electronic topological properties
Prof. Dr. Yu Jia

E-Mail Website
Guest Editor
Key Laboratory for Special Functional Materials of Ministry of Education, Collaborative Innovation Center of Nano Functional Materials and Applications, School of Materials Science and Engineering, Henan University, Kaifeng 475001, China
Interests: low-dimensional physics; electronic topological properties; negative thermal expansion material; catalysis design
Dr. Jiazheng Hao

E-Mail Website
Guest Editor
1. China Spallation Neutron Source (CSNS), Dongguan 523808, China
2. Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China
Interests: magneto-structural phase transition; magnetocaloric effect; barocaloric effect; multicaloric effect; neutron powder diffraction

Special Issue Information

Dear Colleagues,

The magnetocaloric effect (MCE) is among the most intriguing topics in materials science due to its most straightforward application in magnetic refrigeration. The discovery of giant MCE materials, such as NiMn-based Heusler alloys, Gd5Si2Ge2, FeRh, La(Fe,Si)13, Eu2In, and MnCoGe/MnNiGe-based compounds has promoted the developing of the solid-state magnetic refrigeration technique. A common feature of these materials is the strong spin-lattice coupling with the magnetostructural or magnetoelastic first-order magnetic transitions. The giant MCE materials can show negative thermal expansion (NTE) or positive thermal expansion (PTE), depending entirely on the characteristics of the magnetostructural/magnetoelastic transition. Meanwhile, common side effects related to hysteresis and irreversibility can be controlled and tuned by compositional adjustments, chemical/external pressure, or magnetic field.

The purpose of the present Special Issue is to exhibit the recent development on different magnetocaloric materials and pave the way for further studies in this very active research field. Both reviews and original research articles are welcome. We hope you can participate in this Special Issue.

Prof. Dr. Jiantao Wang
Prof. Dr. Yu Jia
Dr. Jiazheng Hao
Guest Editors

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. Crystals 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 2600 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 effects
  • negative thermal expansion
  • positive thermal expansion
  • magnetostructural phase transition
  • magnetoelastic phase transition
  • first-order magnetic transition
  • magnetic refrigeration
  • experimental study
  • first-principles calculation

Published Papers (2 papers)

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Research

13 pages, 4939 KiB  
Article
The Critical Behaviour and Magnetism of MnCoGe0.97Al0.03 Compounds
by Abdul Rashid Abdul Rahman, Muhamad Faiz Md Din, Norinsan Kamil Othman, Jianli Wang, Nur Sabrina Suhaimi, Shi Xue Dou, Noor Fadzilah Mohamed Sharif and Nazrul Fariq Makmor
Crystals 2022, 12(2), 205; https://doi.org/10.3390/cryst12020205 - 29 Jan 2022
Cited by 2 | Viewed by 1846
Abstract
The critical behaviour associated with the field-induced martensitic transformation heavily relies on the vacancy and transition of the magnetic phase in MnCoGe based-compounds. Due to this revelation, an intensive investigation was brought forth to study the substitution of Ge (atomic radius = 1.23 [...] Read more.
The critical behaviour associated with the field-induced martensitic transformation heavily relies on the vacancy and transition of the magnetic phase in MnCoGe based-compounds. Due to this revelation, an intensive investigation was brought forth to study the substitution of Ge (atomic radius = 1.23 Å) by Al (atomic radius = 1.43 Å) in MnCoGe0.97Al0.03 alloy compound. The room-temperature X-ray diffraction indicated that the reflections were identified with the orthorhombic structure (TiNiSi-type, space group Pnma) and minor hexagonal structure (Ni2In-type, space group P63/mmc). The substitution of Al in the supersession of Ge transmuted the crystal structure from TiNiSi-type to Ni2In-type structure. The MnCoGe0.97Al0.03 compound’s magnetism was driven by interactions that are long in range, as indicated by the study of the critical behaviour in the proximity of TC. The magnetic measurement and neutron diffraction revealed that the structural transition took place with the decrease in temperature. The results from neutron diffraction signify that the transformation of the magnetic field-induced martensitic has a crucial function in producing the immense effect of magnetocaloric systems such as these. This outcome serves a critical function for investigations in the future. Full article
(This article belongs to the Special Issue Magnetocaloric Effect and Giant Negative Thermal Expansion)
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10 pages, 3656 KiB  
Article
Magnetism and Thermomechanical Properties in Si Substituted MnCoGe Compounds
by Abdul Rashid Abdul Rahman, Muhamad Faiz Md Din, Jianli Wang, Nur Sabrina Suhaimi, Nurul Hayati Idris, Shi Xue Dou, Mohammad Ismail, Muhammad Zahir Hassan and Mohd Taufik Jusoh
Crystals 2021, 11(6), 694; https://doi.org/10.3390/cryst11060694 - 17 Jun 2021
Cited by 8 | Viewed by 1945
Abstract
MnCoGe-based compounds have been increasingly studied due to their possible large magnetocaloric effect correlated to the magnetostructural coupling. In this research, a comprehensive study of structure, magnetic phase transition, magnetocaloric effect and thermomechanical properties for MnCoGe1−xSix is reported. Room temperature [...] Read more.
MnCoGe-based compounds have been increasingly studied due to their possible large magnetocaloric effect correlated to the magnetostructural coupling. In this research, a comprehensive study of structure, magnetic phase transition, magnetocaloric effect and thermomechanical properties for MnCoGe1−xSix is reported. Room temperature X-ray diffraction indicates that the MnCoGe1−xSix (x = 0, 0.05, 0.1, 0.15 and 0.2) alloys have a major phase consisting of an orthorhombic TiNiSi-type structure with increasing lattice parameter b and decreasing others (a and c) with increasing Si concentration. Along with M-T and DSC measurements, it is indicated that the Tc value increased with higher Si concentration and decreased for structural transition temperature Tstr. The temperature dependence of the magnetization curves overlaps completely, indicating that there is no thermal hysteresis, and it is shown that the transition is the second-order type. It is also shown that the decreased magnetization on the replacement of Si for Ge decreases the value of −ΔSM from −ΔSM~8.36 J kg−1 K−1 at x = 0 to −ΔSM~5.49 J kg−1 K−1 at x = 0.2 with 5 T applied field. The performed Landau theory has confirmed the second-order transition in this study, which is consistent with the Banerjee criterion. The magnetic measurement and thermomechanical properties revealed the structural transition that takes place with Si substitution of Ge. Full article
(This article belongs to the Special Issue Magnetocaloric Effect and Giant Negative Thermal Expansion)
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