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Recent Advances in Entropy-Engineered Functional Materials
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Recent Advances in Entropy-Engineered Functional Materials

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

Deadline for manuscript submissions: closed (20 April 2024) | Viewed by 1521

Special Issue Editor

Dr. Zhi Ren

E-Mail Website
Guest Editor
Department of Physics, School of Science, Westlake University, 18 Shilongshan Road, Hangzhou 310024, China
Interests: exploration of new superconductors; topological quantum states of matter; noncentrosymmetric compounds; high-entropy alloys and ceramics
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

In recent years, entropy engineering has become a promising strategy used to tailor the properties of functional materials. Contrary to traditional philosophy, entropy engineering focuses on the compositions near the center of multicomponent phase diagrams and emphasizes the maximization of entropic energy contributions rather than cohesive energy contributions to free energy. This concept is initially applied to alloys, and later is extended to ceramics, including oxides, nitrides, carbides, borides, and silicides, increasing the number of high-entropy materials with diverse crystal structures and rich properties.

This Special Issue, Recent Advances in Entropy-Engineered Functional Materials, aims to collect innovative and original scientific research. These functionalities include, but are not limited to, superconductivity, magnetism, thermal conductivity, thermoelectricity, Li-ion battery, hardness, and high-temperature applications. Both experimental and theoretical studies will be considered for publication, and short reviews summarizing the latest results are also welcome.

Dr. Zhi Ren
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

  • entropy engineering
  • functional materials
  • superconductivity
  • magnetism
  • thermal conductivity
  • thermoelectricity
  • Li-ion battery
  • hardness
  • high-temperature applications

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Published Papers (2 papers)

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Research

26 pages, 12222 KiB  
Article
High-Temperature Oxidation and Phase Stability of AlCrCoFeNi High Entropy Alloy: Insights from In Situ HT-XRD and Thermodynamic Calculations
by Muhammad Arshad, Saira Bano, Mohamed Amer, Vit Janik, Qamar Hayat and Mingwen Bai
Materials 2024, 17(14), 3579; https://doi.org/10.3390/ma17143579 - 19 Jul 2024
Viewed by 864
Abstract
The high-temperature oxidation behaviour and phase stability of equi-atomic high entropy AlCrCoFeNi alloy (HEA) were studied using in situ high-temperature X-ray diffraction (HTXRD) combined with ThermoCalc thermodynamic calculation. HTXRD analyses reveal the formation of B2, BCC, Sigma and FCC, phases at different temperatures, [...] Read more.
The high-temperature oxidation behaviour and phase stability of equi-atomic high entropy AlCrCoFeNi alloy (HEA) were studied using in situ high-temperature X-ray diffraction (HTXRD) combined with ThermoCalc thermodynamic calculation. HTXRD analyses reveal the formation of B2, BCC, Sigma and FCC, phases at different temperatures, with significant phase transitions observed at intermediate temperatures from 600 °C–100 °C. ThermoCalc predicted phase diagram closely matched with in situ HTXRD findings highlighting minor differences in phase transformation temperature. ThermoCalc predictions of oxides provide insights into the formation of stable oxide phases, predominantly spinel-type oxides, at high p(O2), while a lower volume of halite was predicted, and minor increase observed with increasing temperature. The oxidation behaviour was strongly dependent on the environment, with the vacuum condition favouring the formation of a thin, Al2O3 protective layer, while in atmospheric conditions a thick, double-layered oxide scale of Al2O3 and Cr2O3 formed. The formation of oxide scale was determined by selective oxidation of Al and Cr, as further confirmed by EDX analysis. The formation of thick oxide in air environment resulted in a thick layer of Al-depleted FFC phase. This comprehensive study explains the high-temperature phase stability and time–temperature-dependent oxidation mechanisms of AlCrCoFeNi HEA. The interplay between surface phase transformation beneath oxide scale and oxides is also detailed herein, contributing to further development and optimisation of HEA for high temperature applications. Full article
(This article belongs to the Special Issue Recent Advances in Entropy-Engineered Functional Materials)
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13 pages, 5477 KiB  
Article
Chemical Stability of High-Entropy Spinel in a High-Pressure Pure Hydrogen Atmosphere
by Kamil Domaradzki, Anna Adamczyk, Michał Pyzalski, Tomasz Brylewski, Marek Nowak and Mieczysław Jurczyk
Materials 2024, 17(13), 3309; https://doi.org/10.3390/ma17133309 - 4 Jul 2024
Viewed by 429
Abstract
This paper focuses on high-entropy spinels, which represent a rapidly growing group of materials with physicochemical properties that make them suitable for hydrogen energy applications. The influence of high-pressure pure hydrogen on the chemical stability of three high-entropy oxide (HEO) sinter samples with [...] Read more.
This paper focuses on high-entropy spinels, which represent a rapidly growing group of materials with physicochemical properties that make them suitable for hydrogen energy applications. The influence of high-pressure pure hydrogen on the chemical stability of three high-entropy oxide (HEO) sinter samples with a spinel structure was investigated. Multicomponent HEO samples were obtained via mechanochemical synthesis (MS) combined with high-temperature thermal treatment. Performing the free sintering procedure on powders after MS at 1000 °C for 3 h in air enabled achieving single-phase (Cr0.2Fe0.2Mg0.2Mn0.2Ni0.2)3O4 and (Cu0.2Fe0.2Mg0.2Ni0.2Ti0.2)3O4 powders with a spinel structure, and in the case of (Cu0.2Fe0.2Mg0.2Ti0.2Zn0.2)3O4, a spinel phase in the amount of 95 wt.% was achieved. A decrease in spinel phase crystallite size and an increase in lattice strains were established in the synthesized spinel powders. The hydrogenation of the synthesized samples in a high-pressure hydrogen atmosphere was investigated using Sievert’s technique. The results of XRD, SEM, and EDS investigations clearly showed that pure hydrogen at temperatures of up to 250 °C and a pressure of up to 40 bar did not significantly impact the structure and microstructure of the (Cr0.2Fe0.2Mg0.2Mn0.2Ni0.2)3O4 ceramic, which demonstrates its potential for application in hydrogen technologies. Full article
(This article belongs to the Special Issue Recent Advances in Entropy-Engineered Functional Materials)
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