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Superconductors: Materials and Technology

A special issue of Materials (ISSN 1996-1944). This special issue belongs to the section "Electronic Materials".

Deadline for manuscript submissions: closed (20 July 2023) | Viewed by 3341

Special Issue Editor

Dr. Daniel Gajda

E-Mail Website
Guest Editor
Wlodzimierz Trzebiatowski Institute of Low Temperature and Structure Research of the Polish Academy of Sciences, Wroclaw, Poland
Interests: superconductivity; iron-based superconductors; high-temperature superconductors; critical currents; superconducting wires and cables; magnesium boride

Special Issue Information

Dear Colleagues,

Superconducting wires, tapes, cables and bulks have a large number of applications, e.g. in metallurgy, medicine, energy, mining, military, wind turbines, laboratory research. The application of wires, tapes, cables and bulks depends on their critical parameters (e.g. critical current density, irreversibility magnetic field and critical temperature). The critical parameters depend on e.g. doping, heat treatment, structure of the superconducting material, structural defects and the technology used for the production of e.g. superconducting wire. Currently, MgB2 material, iron-based superconductors and high-temperature superconductors have received the considerable attention owing to their high critical current density and high critical magnetic fields.

We invite researchers to contribute to the Special Issue on Superconductors: Materials and Technology, which is intended to serve as a unique multidisciplinary forum covering broad aspects of the science, technology and application of superconducting materials.

The potential topics include, but are not limited to:

  • MgB2 wires and tape - powder in a tube (PIT)
  • MgB2 wires – internal Mg infiltration (IMD)
  • iron-based superconductors wires
  • high-temperature superconductors tape
  • critical current density
  • pinning centers
  • synthesis of superconducting materials

Dr. Daniel Gajda
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. Materials is an international peer-reviewed open access semimonthly 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

  • iron-based superconductors
  • high-temperature superconductors
  • MgB2 material
  • wires
  • cables
  • tape
  • bulks
  • critical current density
  • pinning centers - structural defects
  • critical parameters (Tc. Birr, Bc2)

Published Papers (3 papers)

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Research

6 pages, 1263 KiB  
Communication
Superconducting In Situ/Post In Situ MgB2 Joints
by Bartlomiej Andrzej Glowacki
Materials 2023, 16(19), 6588; https://doi.org/10.3390/ma16196588 - 7 Oct 2023
Viewed by 726
Abstract
The superconducting joints of superconducting in situ MgB2 wires have been of great interest since the first MgB2 wires were manufactured. The necessity of joining fully reacted wires in applications such as NMR brings complexity to the methodology of connecting already [...] Read more.
The superconducting joints of superconducting in situ MgB2 wires have been of great interest since the first MgB2 wires were manufactured. The necessity of joining fully reacted wires in applications such as NMR brings complexity to the methodology of connecting already reacted wires sintered under optimised conditions via a mixture of Mg + 2B and subsequential second heat treatment to establish fully superconducting MgB2 joints. Some of the data in the literature resolved such a procedure by applying high cold pressure and sintering at a low temperature. A topical review publication did not address in depth the question of whether cold sintering is a potential solution, suggesting that hot pressing is the way forward. In this paper, we discuss the potential joint interfacial requirements, suggesting a thermo-mechanical procedure to successfully form a superconductive connection of two in situ reacted wires in the presence of Mg + 2B flux. The critical current at 25 K of the researched junction achieved 50% Ic for an individual in situ wire. Full article
(This article belongs to the Special Issue Superconductors: Materials and Technology)
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15 pages, 5800 KiB  
Article
Effect of Low Annealing Temperature on the Critical-Current Density of 2% C-Doped MgB2 Wires Used in Superconducting Coils with the Wind-and-React (W&R) Method—High-Field and High-Temperature Pinning Centers
by Tomasz Czujko, Daniel Gajda, Matt Rindfleisch, Michał Babij and Andrzej Zaleski
Materials 2023, 16(18), 6157; https://doi.org/10.3390/ma16186157 - 11 Sep 2023
Viewed by 823
Abstract
The use of a low annealing temperature during the production of coils made from superconducting materials is very important because it reduces the production costs. In this study, the morphology, transport critical-current density (Jc), irreversible magnetic field (Birr [...] Read more.
The use of a low annealing temperature during the production of coils made from superconducting materials is very important because it reduces the production costs. In this study, the morphology, transport critical-current density (Jc), irreversible magnetic field (Birr), and critical temperature (Tc) of straight wires and small 2% C-doped MgB2 coils were investigated. The coils were made using the wind-and-react (W&R) method and annealed at various temperatures from 610 °C to 650 °C for 2–12 h. Critical-current measurements were made for both the coils and straight wires at the temperatures of 4.2 K, 20 K, 25 K, and 30 K. During our research study, we determined the process window that provides the best critical parameters of the coils (annealing at a temperature of 650 °C for 6 h). Moreover, we observed that small coils made with unreacted MgB2 wire and then annealed had morphology and critical parameters similar to those of straight 2% C-doped MgB2 wires. Moreover, small-diameter bending of 20 mm and 10 mm did not lead to transverse cracks, which can cause a large reduction in Jc in the coils. This indicates that the processes of optimization of thermal treatment parameters can be carried out on straight MgB2 wires for MgB2 superconducting coils. Full article
(This article belongs to the Special Issue Superconductors: Materials and Technology)
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16 pages, 27450 KiB  
Article
Enhanced Superconducting Critical Parameters in a New High-Entropy Alloy Nb0.34Ti0.33Zr0.14Ta0.11Hf0.08
by Rafał Idczak, Wojciech Nowak, Bartosz Rusin, Rafał Topolnicki, Tomasz Ossowski, Michał Babij and Adam Pikul
Materials 2023, 16(17), 5814; https://doi.org/10.3390/ma16175814 - 24 Aug 2023
Viewed by 1024
Abstract
The structural and physical properties of the new titanium- and niobium-rich type-A high-entropy alloy (HEA) superconductor Nb0.34Ti0.33Zr0.14Ta0.11Hf0.08 (in at.%) were studied by X-ray powder diffraction, energy dispersive X-ray spectroscopy, magnetization, electrical resistivity, and specific [...] Read more.
The structural and physical properties of the new titanium- and niobium-rich type-A high-entropy alloy (HEA) superconductor Nb0.34Ti0.33Zr0.14Ta0.11Hf0.08 (in at.%) were studied by X-ray powder diffraction, energy dispersive X-ray spectroscopy, magnetization, electrical resistivity, and specific heat measurements. In addition, electronic structure calculations were performed using two complementary methods: the Korringa–Kohn–Rostoker Coherent Potential Approximation (KKR-CPA) and the Projector Augmented Wave (PAW) within Density Functional Theory (DFT). The results obtained indicate that the alloy exhibits type II superconductivity with a critical temperature close to 7.5 K, an intermediate electron–phonon coupling, and an upper critical field of 12.2(1) T. This finding indicates that Nb0.34Ti0.33Zr0.14Ta0.11Hf0.08 has one of the highest upper critical fields among all known HEA superconductors. Full article
(This article belongs to the Special Issue Superconductors: Materials and Technology)
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