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Crystals
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Heusler Alloys
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Heusler Alloys

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

Deadline for manuscript submissions: closed (15 May 2020) | Viewed by 11659

Special Issue Editor

Dr. Karol Załęski

E-Mail Website
Guest Editor
Uniwersytet im. Adama Mickiewicza w Poznaniu, NanoBioMedical Centre, Poznan, Poland
Interests: Magnetic Heusler alloys; Magnetic shape memory; Synthesis and growth of Heusler alloys

Special Issue Information

Dear Colleagues,

The Special Issue on “Heusler Alloys” is dedicated to research on the theory, growth, functional properties and device applications of Heusler alloys. Since their discovery, Heusler alloys have received ever more attention from researchers, leading to an increase of the Heusler alloys’ family to over 1000 members. Depending on the elements located at each sublattice of the crystal structure of the Heusler alloys, a number of different properties can arise: half-metallicity, magnetic shape memory, thermoelectricity, topological insulator behavior and skyrmions, among many others. The vast array of physical effects makes these materials one of the most interesting material classes in the research area of Materials Science.

We hope this Special Issue on Heusler Alloys becomes a valuable forum for researchers and scientists working on both the theoretical and experimental aspects of Heusler alloys.

Dr. Karol Załęski
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. 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

  • Synthesis and growth of Heusler alloys (bulk and thin films)
  • Magnetic Heusler alloys
  • Thermoelectric Heusler alloys
  • Topological insulators behavior in Heusler alloys
  • Magnetic shape memory
  • Spintronic devices based on Heusler alloys
  • DFT calculations of Heusler alloys’ band structures

Published Papers (4 papers)

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Research

11 pages, 1693 KiB  
Article
Martensitic Transformation and Crystalline Structure of Ni50Mn50−xSnx Melt-Spun Heusler Alloys
by Rim Ameur, Mahmoud Chemingui, Tarek Bachaga, Lluisa Escoda, Mohamed Khitouni and Joan-Josep Suñol
Crystals 2020, 10(10), 853; https://doi.org/10.3390/cryst10100853 - 23 Sep 2020
Cited by 2 | Viewed by 1745
Abstract
The structure and thermal behavior are key factors that influence the functional response of Ni–Mn–Sn alloys. The present study reports the production as well as the structure and thermal analysis of melt-spun (solidification rate: 40 ms−1) Ni50 Mn50−xSn [...] Read more.
The structure and thermal behavior are key factors that influence the functional response of Ni–Mn–Sn alloys. The present study reports the production as well as the structure and thermal analysis of melt-spun (solidification rate: 40 ms−1) Ni50 Mn50−xSnx (x = 10, 11, 12 and 13 at.%) alloys. X-ray diffraction measurements were performed at room temperature. The austenite state has an L21 structure, whereas the structure of the martensite is 7M or 10M (depending on the Sn/Mn percentage). Furthermore, the structural martensitic transformation was detected by differential scanning calorimetry (DSC). As expected, upon increasing the Sn content, the characteristic temperatures also increase. The same tendency is detected in the thermodynamic parameters (entropy and enthalpy). The e/a control allows the development production of alloys with a transformation close to room temperature. Full article
(This article belongs to the Special Issue Heusler Alloys)
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18 pages, 6453 KiB  
Article
Microstructural and In Situ Lorentz TEM Domain Characterization of As-Quenched and γ’-Precipitated Co49Ni30Ga21 Monocrystal
by Andrzej M. Zak and Wlodzimierz Dudzinski
Crystals 2020, 10(3), 153; https://doi.org/10.3390/cryst10030153 - 28 Feb 2020
Cited by 3 | Viewed by 3796
Abstract
The article concerns the rarely described magnetic domain structure of Heusler alloys in the case of a single crystal [100]-oriented Co-Ni-Ga alloy. The structure of the magnetic domains of the alloy was compared in two states: in the quenched and additionally aged state. [...] Read more.
The article concerns the rarely described magnetic domain structure of Heusler alloys in the case of a single crystal [100]-oriented Co-Ni-Ga alloy. The structure of the magnetic domains of the alloy was compared in two states: in the quenched and additionally aged state. Ageing led to precipitation of the spherical phase γ’ nanoparticles (Co-rich, FCC lattice with a = 0.359 nm). Lorentz transmission electron microscopy observation methods combined with cooling and in situ heating of the sample in the transmission electron microscope in the temperature range from 140 K to 300 K were combined to observe the magnetic domain structure. Significant differences in the dimensions and morphology of magnetic domain boundaries have been demonstrated. The quenched sample showed no change in stripe domain structure when the aged sample showed significant development of branching magnetic structures. This may be due to a change in the chemical composition of the matrix resulting from a decrease in cobalt and nickel content at the expense of precipitations. Full article
(This article belongs to the Special Issue Heusler Alloys)
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9 pages, 2597 KiB  
Article
Creep of Heusler-Type Alloy Fe-25Al-25Co
by Ferdinand Dobeš, Petr Dymáček and Martin Friák
Crystals 2020, 10(1), 52; https://doi.org/10.3390/cryst10010052 - 20 Jan 2020
Cited by 1 | Viewed by 2288
Abstract
Creep of an alloy based on the intermetallic compound Fe2AlCo was studied by compressive creep tests in the temperature range from 873 to 1073 K. The stress exponent n and the activation energy of creep Q were determined using the multivariable [...] Read more.
Creep of an alloy based on the intermetallic compound Fe2AlCo was studied by compressive creep tests in the temperature range from 873 to 1073 K. The stress exponent n and the activation energy of creep Q were determined using the multivariable regression of the creep-rate data and their description by means of sinh equation (Garofalo equation). The evaluated stress exponents indicate that the dislocation climb controls creep deformation. The estimated apparent activation energies for creep are higher than the activation enthalpy for the diffusion of Fe in Fe3Al. This can be ascribed to the changes in crystal lattice and changing microstructure of the alloy. Full article
(This article belongs to the Special Issue Heusler Alloys)
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14 pages, 12588 KiB  
Article
Theoretical Study of the Electronic and Magnetic Properties and Phase Stability of the Full Heusler Compound Pd2CoAl
by Liyu Hao, Jiaxue You, Rabah Khenata, Yanfeng Wang, Xiaotian Wang and Tie Yang
Crystals 2019, 9(8), 422; https://doi.org/10.3390/cryst9080422 - 14 Aug 2019
Cited by 5 | Viewed by 3293
Abstract
Based on first principles calculation, a systematical investigation has been performed to study the electronic, magnetic, dynamic, and mechanical properties of the full Heusler compound Pd2CoAl. It is found that the L21-type structure is energetically more stable than [...] Read more.
Based on first principles calculation, a systematical investigation has been performed to study the electronic, magnetic, dynamic, and mechanical properties of the full Heusler compound Pd2CoAl. It is found that the L21-type structure is energetically more stable than the XA-type due to the lower total energy. The obtained lattice constant in cubic ground state is 6.057 Å, which matches well with previous study. The calculated electronic band structure reveals the metallic nature of Pd2CoAl and its total magnetic moment of 1.78 μB is mainly contributed by Co atom from strong spin splitting effect, as indicated with the distinctive distributions of the density of states in two spin directions. Under uniform strains from −5% to +5%, the variation of total magnetic moment has been obtained and it is still caused by the much larger change from Co atom, compared with Pd and Al atoms. The tetragonal structure has further been analyzed and we found that there is possible martensitic phase transformation because the total energy can be further reduced when the cubic structure is varied into the tetragonal one. The large energy difference of 0.165 eV between the tetragonal and cubic phases is found at the c/a ratio of 1.30. The total density of states has been compared between the cubic and tetragonal phases for Pd2CoAl and results show tetragonal phase transformation could reduce the states at the Fermi energy level in both directions. In addition, the dynamic and mechanical stabilities have also been evaluated for Pd2CoAl in both cubic and tetragonal structures and results confirm that the tetragonal phase shows good stability against the cubic phase, which further verifies that the tetragonal phase transformation is highly expected. In the end, the strong elastic anisotropy in the tetragonal structure has been clearly shown with the calculated directional dependence of the Young’s modulus and shear modulus. Full article
(This article belongs to the Special Issue Heusler Alloys)
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