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Special Issue "High-Entropy Ceramics: Synthesis and Applications"

A special issue of Materials (ISSN 1996-1944). This special issue belongs to the section "Advanced and Functional Ceramics and Glasses".

Deadline for manuscript submissions: 20 December 2022 | Viewed by 3106

Special Issue Editors

Dr. Mattia Biesuz
E-Mail Website
Guest Editor
Department of Industrial Engineering, University of Trento, Via Sommarive 9, 38123 Trento, Italy
Interests: sintering; field assisted sintering; flash sintering; spark plasma sintering; high entropy; porous ceramics
Special Issues, Collections and Topics in MDPI journals
Dr. Luca Spiridigliozzi
E-Mail Website
Guest Editor
Department of Civil and Mechanical Engineering, University of Cassino and Southern Lazio, Via G. Di Biasio 43, 03043 Cassino, Italy
Interests: advanced ceramic materials; entropy-stabilized oxides; rare-earths-based materials; wet-chemical synthesis; sintering
Special Issues, Collections and Topics in MDPI journals
Dr. Václav Tyrpekl
E-Mail Website
Guest Editor
Department of Inorganic Chemistry, Faculty of Science Charles University, 128 00 Prague, Czech Republic
Interests: ceramics; sintering; high-entropy ceramics; nuclear fuel cycle

Special Issue Information

Dear Colleagues,

The solid solutions of complex ceramics are currently attracting growing scientific interest due to their unique combination of functional and mechanical properties. In particular, the entropy-driven stabilization of new phases and compositions represents a kind of new “far west for ceramurgists”. This approach allows the development of novel materials with still unexplored properties. Moreover, the presence of different cations (typically 5+) in the high-entropy ceramic (HEC) structures helps to fine-tune their properties and composition in a multidimensional space.

Due to their complex composition, high-entropy ceramics require advanced processing routes, often aided also by the development of predictive models to define their thermal stability. As such, HECs have been manufactured by various synthesis processes, including sol-gel processing, wet chemical synthesis, spray pyrolysis, solid-state synthesis, and others. Moreover, various sintering processes have been applied to high-entropy ceramics, such as SPS, flash sintering, UHS, and conventional sintering.

In this Special Issue, new trends in the field of high-entropy ceramics are highlighted with a specific focus on structural simulations, processing, and properties. Both theoretical and experimental works are welcomed, including full-length papers, communications, and reviews.

Dr. Mattia Biesuz
Dr. Luca Spiridigliozzi
Dr. Václav Tyrpekl
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. 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 2300 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

  • high-entropy ceramics
  • entropy-stabilized ceramics
  • sol-gel
  • chemical synthesis
  • nanopowder
  • sintering
  • electrochemical properties
  • solid state synthesis
  • solid solutions
  • ceramics

Published Papers (3 papers)

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Research

Article
Analysis of the Electroconsolidation Process of Fine-Dispersed Structures Out of Hot Pressed Al2O3–WC Nanopowders
Materials 2021, 14(21), 6503; https://doi.org/10.3390/ma14216503 - 29 Oct 2021
Cited by 6 | Viewed by 521
Abstract
Fabrication of alumina–tungsten carbide nanocomposite was investigated. Characteristics of the densification and sintering were analyzed considering both the nano-size particle starting powders and the processing stages. Different heating rates were generated during densification and consolidation with a maximal load was applied only after [...] Read more.
Fabrication of alumina–tungsten carbide nanocomposite was investigated. Characteristics of the densification and sintering were analyzed considering both the nano-size particle starting powders and the processing stages. Different heating rates were generated during densification and consolidation with a maximal load was applied only after a temperature of 1000 °C was reached. Due to the varying dominance of different physical processes affecting the grains, appropriate heating rates and pressure at different stages ensured that a structure with submicron grains was obtained. With directly applied alternating current, it was found that the proportion Al2O3 (50 wt.%)–WC provided the highest fracture toughness, and a sintering temperature above 1600 °C was found to be disadvantageous. High heating rates and a short sintering time enabled the process to be completed in 12 min, saving energy and time. Full article
(This article belongs to the Special Issue High-Entropy Ceramics: Synthesis and Applications)
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Article
Effect of Processing Conditions on the Flash Onset Temperature in Hydroxyapatite
Materials 2021, 14(18), 5229; https://doi.org/10.3390/ma14185229 - 11 Sep 2021
Cited by 2 | Viewed by 557
Abstract
When heat and electric field are applied to the sample, sintering takes place within a short time of a few seconds by the flash phenomenon that occurs. In what condition flash does occur is a main issue for the flash sintering technique. In [...] Read more.
When heat and electric field are applied to the sample, sintering takes place within a short time of a few seconds by the flash phenomenon that occurs. In what condition flash does occur is a main issue for the flash sintering technique. In this study, the effect of processing conditions such as sintering atmosphere, sample size, density and grain size on the flash onset of hydroxyapatite was investigated. In a vacuum atmosphere, a flash occurred at a lower temperature by 50–100 °C than in air. The smaller the thickness of the sample, the higher the flash onset temperature due to the larger specific surface area. Flash was also observed in samples which were presintered, having a density of 86–100% and a grain size of 0.2–0.9 μm. When the density and grain size of the sample were higher and larger, the flash onset temperature was higher. It was because the diffusion and conduction path through the grain boundary and the inner surface of the pores with high defect concentration are blocked with an increase of density or grain size. When an electric field was applied during flash sintering, a color change of the sample was observed and the reason was discussed. Full article
(This article belongs to the Special Issue High-Entropy Ceramics: Synthesis and Applications)
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Article
Spark Plasma Sintering of LiFePO4: AC Field Suppressing Lithium Migration
Materials 2021, 14(11), 2826; https://doi.org/10.3390/ma14112826 - 25 May 2021
Cited by 3 | Viewed by 1290
Abstract
Our work proposes a comparison between Spark Plasma Sintering of LiFePO4 carried out using an Alternating Current (AC) and Direct Current (DC). It quantifies the Li-ion migration using DC, and it validates such hypothesis using impedance spectroscopy, X-ray photoelectron spectroscopy and inductively [...] Read more.
Our work proposes a comparison between Spark Plasma Sintering of LiFePO4 carried out using an Alternating Current (AC) and Direct Current (DC). It quantifies the Li-ion migration using DC, and it validates such hypothesis using impedance spectroscopy, X-ray photoelectron spectroscopy and inductively coupled plasma optical emission spectroscopy. The use of an AC field seems effective to inhibit undesired Li-ion migration and achieve high ionic conductivity as high as 4.5 × 10−3 S/cm, which exceeds by one order of magnitude samples processed under a DC field. These results anticipate the possibility of fabricating a high-performance all-solid-state Li-ion battery by preventing undesired Li loss during SPS processing. Full article
(This article belongs to the Special Issue High-Entropy Ceramics: Synthesis and Applications)
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