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Journal articles on the topic 'High entropy oxide'

Author: Grafiati

Published: 6 September 2023

Last updated: 31 July 2025

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1

Oh, Seeun, Dongyeon Kim, and Kang Taek Lee. "High Entropy Perovskite Electrolytes for Reversible Protonic Ceramic Electrochemical Cells." ECS Meeting Abstracts MA2023-01, no. 54 (2023): 270. http://dx.doi.org/10.1149/ma2023-0154270mtgabs.

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Reversible protonic ceramic electrochemical cells (R-PCECs) become cornerstones of low-temperature solid oxide electrochemical cells (SOCs) below 600 °C. Low activation energy and high energy conversion efficiency are primary significance of R-PCECs. However, electrolytes of high-performance R-PCECs still suffer from poor tolerance to complex operating conditions. To overcome their low stability and enhance proton conductivity, various cations have been doped into the Ba-based perovskite oxide electrolyte. Developing high entropy oxides by introducing multiple metal cations into A- or B- sites

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Oh, Seeun, Dongyeon Kim, and Kang Taek Lee. "High Entropy Perovskite Electrolytes for Reversible Protonic Ceramic Electrochemical Cells." ECS Transactions 111, no. 6 (2023): 1743–49. http://dx.doi.org/10.1149/11106.1743ecst.

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Reversible protonic ceramic electrochemical cells (R-PCECs) have become the cornerstone of low-temperature solid oxide electrochemical cells (SOCs) below 600 °C. Low activation energy and high energy conversion efficiency are primary significance of R-PCECs. However, electrolytes of high-performance R-PCECs still suffer from poor tolerance to complex operating conditions. To overcome their low stability and enhance proton conductivity, various cations have been doped into the Ba-based perovskite oxide electrolyte. Developing high entropy oxides by introducing multiple metal cations into A- or

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3

Meisenheimer, P. B., and J. T. Heron. "Oxides and the high entropy regime: A new mix for engineering physical properties." MRS Advances 5, no. 64 (2020): 3419–36. http://dx.doi.org/10.1557/adv.2020.295.

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AbstractHistorically, the enthalpy is the criterion for oxide materials discovery and design. In this regime, highly controlled thin film epitaxy can be leveraged to manifest bulk and interfacial phases that are non-existent in bulk equilibrium phase diagrams. With the recent discovery of entropy-stabilized oxides, entropy and disorder engineering has been realized as an orthogonal approach. This has led to the nucleation and rapid growth of research on high-entropy oxides – multicomponent oxides where the configurational entropy is large but its contribution to its stabilization need not be s

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Bridges, Craig A., Bishnu Prasad Thapaliya, Albina Borisevich, Juntian Fan, and Sheng Dai. "(Invited) High Entropy Multication Oxide Battery Materials." ECS Meeting Abstracts MA2022-02, no. 1 (2022): 29. http://dx.doi.org/10.1149/ma2022-02129mtgabs.

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High entropy oxides (HEOs), in which multication occupation of a single crystallographic site plays an important role in the properties, have become relevant in energy storage [1,2], catalysis [3.4], and many more areas. In a subset of these compounds the entropy, rather than enthalpy, plays a dominant role in stabilizing a single-phase structure at high temperatures. In other cases, the multication occupation merely contributes to stability and properties, but the entropy remains dominant in the stability. The field originated with high entropy metal alloys (HEAs)[5], and then expanded to oxi

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Li, Haoyang, Yue Zhou, Zhihao Liang, et al. "High-Entropy Oxides: Advanced Research on Electrical Properties." Coatings 11, no. 6 (2021): 628. http://dx.doi.org/10.3390/coatings11060628.

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The concept of “high entropy” was first proposed while exploring the unknown center of the metal alloy phase diagram, and then expanded to oxides. The colossal dielectric constant found on the bulk high-entropy oxides (HEOs) reveals the potential application of the high-entropy oxides in the dielectric aspects. Despite the fact that known HEO thin films have not been reported in the field of dielectric properties so far, with the high-entropy effects and theoretical guidance of high entropy, it is predictable that they will be discovered. Currently, researchers are verifying that appropriately

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Ding, Yiwen, Keju Ren, Chen Chen, et al. "High-entropy perovskite ceramics: Advances in structure and properties." Processing and Application of Ceramics 18, no. 1 (2024): 1–11. http://dx.doi.org/10.2298/pac2401001d.

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High-entropy ceramic materials usually refer to the multi-principal solid solution formed by 5 or more ceramic components. Due to its novel ?high-entropy effect? and excellent performance, it has become one of the research hotspots in the field of ceramics in recent years. As the research system of high-entropy ceramics has gradually expanded from the initial rock salt oxides (Mg-Ni-Co-Cu-Zn)O to fluorite oxides, perovskite oxides, spinel oxides, borides, carbides and silicates, its special mechanical, electrical, magnetic and energy storage properties have been continuously discovered. Based

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Sharma, Yogesh, Min-Cheol Lee, Krishna Chaitanya Pitike, et al. "High Entropy Oxide Relaxor Ferroelectrics." ACS Applied Materials & Interfaces 14, no. 9 (2022): 11962–70. http://dx.doi.org/10.1021/acsami.2c00340.

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Kajitani, Tsuyoshi, Yuzuru Miyazaki, Kei Hayashi, Kunio Yubuta, X. Y. Huang, and W. Koshibae. "Thermoelectric Energy Conversion and Ceramic Thermoelectrics." Materials Science Forum 671 (January 2011): 1–20. http://dx.doi.org/10.4028/www.scientific.net/msf.671.1.

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Oxide thermoelectrics are relatively new materials that are workable at temperatures in the range of 400K≤T≤1200K. There are several types of thermoelectric oxide, namely, cobalt oxides (p-type semi-conductors), manganese oxides (n-type) and zinc oxides (n-type semi-conductors) for high temperature energy harvesting. The Seebeck coefficient of 3d metal oxide thermoelectrics is relatively high due to either high density of states at Fermi surfaces or spin entropy flow associated with the carrier flow. The spin entropy part dominates the Seebeck coefficient of 3d-metal oxides at temperatures abo

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9

Anandkumar, Mariappan, Kannan Pidugu Kesavan, Shanmugavel Sudarsan, et al. "Phase Evolution of High-Entropy Stannate Pyrochlore Oxide Synthesized via Glycine-Assisted Sol–Gel Synthesis as a Thermal Barrier Coating Material." Nanomaterials 15, no. 12 (2025): 939. https://doi.org/10.3390/nano15120939.

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High-entropy ceramics have gained wider attention due to their structural integrity and stability, which can be used in various functional applications. Especially, high-entropy oxides exhibit excellent thermal stability, particularly at high temperatures. Thermal barrier coating materials must demonstrate good thermal stability without any phase transformation or phase separation, which is critical in aerospace and energy conversion applications. To address this, we have prepared new high-entropy stannate pyrochlore oxide nanoparticles with the composition (Gd0.2Nd0.2La0.2Pr0.2Sm0.2)2Sn2O7 th

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10

Shahbazi, Hessam, Pardis Seraji, Husam Farraj, et al. "Resiliency, morphology, and entropic transformations in high-entropy oxide nanoribbons." Science 388, no. 6750 (2025): 950–56. https://doi.org/10.1126/science.adr5604.

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We present the successful synthesis and characterization of a one-dimensional high-entropy oxide (1D-HEO) exhibiting nanoribbon morphology. These 1D-HEO nanoribbons exhibit high structural stability at elevated temperatures (to 1000°C), elevated pressures (to 12 gigapascals), and long exposure to harsh acid or base chemical environments. Moreover, they exhibit notable mechanical properties, with an excellent modulus of resilience reaching 40 megajoules per cubic meter. High-pressure experiments reveal an intriguing transformation of the 1D-HEO nanoribbons from orthorhombic to cubic structures

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11

YILDIZ, İlker. "Synthesis and characterization of b-site controlled la-based high entropy perovskite oxides." Journal of Scientific Reports-A, no. 055 (December 31, 2023): 124–31. http://dx.doi.org/10.59313/jsr-a.1370632.

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High entropy perovskite oxide materials are a highly promising class of materials with a wide range of potential applications. They offer a unique combination of perovskite oxides and high entropy oxides, making them suitable for various fields, particularly in electrochemical energy storage systems and hydrogen production. Given the growing demand for clean energy and efficient energy storage solutions, the development of high entropy materials holds great significance. In this study, a cost-effective and rapid fabrication method was employed to produce several single-phase high entropy perov

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12

Przygucka, Dominika, Adelajda Polkowska, Wojciech Polkowski, Krzysztof Karczewski, and Stanisław Jóźwiak. "Titanium Oxide Formation in TiCoCrFeMn High-Entropy Alloys." Materials 18, no. 2 (2025): 412. https://doi.org/10.3390/ma18020412.

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High-entropy materials, characterized by complex chemical compositions, are difficult to identify and describe structurally. These problems are encountered at the composition design stage when choosing an effective method for predicting the final phase structure of the alloy, which affects its functional properties. In this work, the effects of introducing oxide precipitates into the matrix of a high-entropy TiCoCrFeMn alloy to strengthen ceramic particles were studied. The particles were introduced by the ex situ method, such as TiO2 in the form of anatase, and by the in situ method, consisti

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13

Lin, Wei-Chih, Yi-Wen Lien, Louis Etienne Moreau, et al. "High-Temperature Oxidation of NbTi-Bearing Refractory Medium- and High-Entropy Alloys." Materials 17, no. 18 (2024): 4579. http://dx.doi.org/10.3390/ma17184579.

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The oxidation of six NbTi-i refractory medium- and high-entropy alloys (NbTi + Ta, NbTi + CrTa, NbTi + AlTa, NbTi + AlMo, NbTi + AlMoTa and NbTi + AlCrMo) were investigated at 1000 °C for 20 h. According to our observation, increased Cr content promoted the formation of protective CrNbO4 and Cr2O3 oxides in NbTi + CrTa and NbTi + AlCrMo, enhancing oxidation resistance. The addition of Al resulted in the formation of AlTi-rich oxide in NbTi + AlTa. Ta addition resulted in the formation of complex oxides (MoTiTa8O25 and TiTaO4) and decreased oxidation resistance. Meanwhile, Mo’s low oxygen solub

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CAYIRLI, Meltem, Esra ERDOGAN-ESEN, Ersu LOKCU, and Mustafa ANIK. "Synthesis and Electrochemical Performance of Spinel Crystal Structured ((FeNiCrMn)1-xCox)3O4 (x=0.1, 0.2, 0.3) High Entropy Oxides." Eurasia Proceedings of Science Technology Engineering and Mathematics 16 (December 31, 2021): 140–44. http://dx.doi.org/10.55549/epstem.1068579.

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High entropy oxides are a new class of materials with a single-phase structure consisting of five or more components. Due to their high structural stability and electrochemical performance, they have attracted a lot of attention in recent years. In this study, high entropy oxides with the composition ((FeNiCrMn)1-xCox)3O4 (x=0.1, 0.2, 0.3) were synthesized using the solid state method and their electrochemical performances as anode material for lithium-ion battery were investigated. Spinel crystal structured of high entropy oxides were characterized by X-ray diffraction (XRD) technique. The el

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15

Tanveer, Rubayet, and Veerle M. Keppens. "Resonant ultrasound spectroscopy studies of high-entropy fluorites." Journal of the Acoustical Society of America 152, no. 4 (2022): A131. http://dx.doi.org/10.1121/10.0015786.

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High entropy oxides (HEOs), also referred to as multicomponent oxides or compositionally complex oxides (CCOs), have attracted attention due to the tunability of multiple cations on a single site. Since the introduction of HEOs stabilized in the rocksalt phase, the high entropy oxide concept has been expanded to various structures, offering a path for the discovery of innovative compounds with unique structure-property relations. Here, we present a study of high entropy fluorites, which have gained recognition for their low thermal conductivity and possible applications as thermal barrier coat

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16

Hashishin, Takeshi, Haruka Taniguchi, Fei Li, and Hiroya Abe. "Useful High-Entropy Source on Spinel Oxides for Gas Detection." Sensors 22, no. 11 (2022): 4233. http://dx.doi.org/10.3390/s22114233.

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This study aimed to identify a useful high-entropy source for gas detection by spinel oxides that are composed of five cations in nearly equal molar amounts and free of impurities. The sensor responses of the spinel oxides [1# (CoCrFeMnNi)3O4, 2# (CoCrFeMnZn)3O4, 3# (CoCrFeNiZn)3O4, 4# (CoCrMnNiZn)3O4, 5# (CoFeMnNiZn)3O4, and 6# (CrFeMnNiZn)3O4] were evaluated for the test gases (7 ppm NO2, 5000 ppm H2, 3 ppm NH3, and 3 ppm H2S). In response to NO2, 1# and 2# showed p-type behavior while 3–6# showed n-type semiconductor behavior. There are three p-type and one n-type AO structural compositions

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17

Ke, Lingsheng, Long Meng, Sheng Fang, Chun Lin, Mingtian Tan, and Tao Qi. "High-Temperature Oxidation Behaviors of AlCrTiSi0.2 High-Entropy Alloy Doped with Rare Earth La and Y." Crystals 13, no. 8 (2023): 1169. http://dx.doi.org/10.3390/cryst13081169.

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High-entropy alloys (HEAs) were prepared with strong antioxidant metals Al, Cr, Ti, and Si as matrix elements, and the effects of rare earth (RE) lanthanum (La) and yttrium (Y) doping on their microstructures and high-temperature oxidation resistance were explored in this study. The AlCrTiSi0.2RE0.02 HEAs were prepared by using vacuum arc melting and were oxidized mass gain at 1000 °C. After oxidation for 53 h, AlCrTiSi0.2 HEA had a mass increase of 1.195 mg/cm2, and it had the best oxidation resistance of three HEAs (AlCrTiSi0.2, AlCrTiSi0.2La0.02, and AlCrTiSi0.2Y0.02). The surface oxide lay

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18

Wang, Junfeng, Qiaobai He, Guanqi Liu, et al. "High-Temperature Oxidation Behavior of AlTiNiCuCox High-Entropy Alloys." Materials 14, no. 18 (2021): 5319. http://dx.doi.org/10.3390/ma14185319.

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In this study, the high-temperature oxidation behavior of a series of AlTiNiCuCox high-entropy alloys (HEAs) was explored. The AlTiNiCuCox (x = 0.5, 0.75, 1.0, 1.25, 1.5) series HEAs were prepared using a vacuum induction melting furnace, in which three kinds of AlTiNiCuCox (x = 0.5, 1.0, 1.5) alloys with different Co contents were oxidized at 800 °C for 100 h, and their oxidation kinetic curves were determined. The microstructure, morphology, structure, and phase composition of the oxide film surface and cross-sectional layers of AlTiNiCuCox series HEAs were analyzed using scanning electron m

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Xu, Yangsen, Xi Xu, and Lei Bi. "A high-entropy spinel ceramic oxide as the cathode for proton-conducting solid oxide fuel cells." Journal of Advanced Ceramics 11, no. 5 (2022): 794–804. http://dx.doi.org/10.1007/s40145-022-0573-7.

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AbstractA high-entropy ceramic oxide is used as the cathode for the first time for proton-conducting solid oxide fuel cells (H-SOFCs). The Fe0.6Mn0.6Co0.6Ni0.6Cr0.6O4 (FMCNC) high-entropy spinel oxide has been successfully prepared, and the in situ chemical stability test demonstrates that the FMCNC material has good stability against CO2. The first-principles calculation indicates that the high-entropy structure enhances the properties of the FMCNC material that surpasses their individual components, leading to lower O2 adsorption energy for FMCNC than that for the individual components. The

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20

Wang, Lin, Quanqing Zeng, Zhibao Xie, Yun Zhang, and Haitao Gao. "High Temperature Oxidation Behavior of an Equimolar Cr-Mn-Fe-Co High-Entropy Alloy." Materials 14, no. 15 (2021): 4259. http://dx.doi.org/10.3390/ma14154259.

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The oxidation behavior of an equimolar Cr-Mn-Fe-Co high-entropy alloy (HEA) processed by 3D laser printing was investigated at 700 °C and 900 °C. The oxidation kinetics of the alloy followed the parabolic rate law, and the oxidation rate constant increased with the rising of the temperature. Inward diffusion of oxygen and outward diffusion of cations took place during the high-temperature oxidation process. A spinel-type oxide was formed on the surface, and the thickness of the oxide layer increased with the rising of experimental temperature or time. The exfoliation of the oxide layer took pl

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21

Kobayashi, Yasukazu, Shota Yokoyama, and Ryo Shoji. "High-Entropy Alloy Al0.2Co1.5CrFeNi1.5Ti0.5 Prepared from High-Entropy Oxide (Al0.2Co1.5CrFeNi1.5Ti0.5)3O4 by a Deoxidation Process via a CaH2-Assisted Molten Salt Method." Metals 14, no. 4 (2024): 443. http://dx.doi.org/10.3390/met14040443.

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High-entropy alloys (HEAs) have attracted a great deal of research interest these days because of their attractive properties. Low-temperature chemical synthesis methods are being developed to obtain nanoscale HEAs with low energy consumption. In this study, we prepared HEA Al0.2Co1.5CrFeNi1.5Ti0.5 nanoparticles from high-entropy oxide (HEO) (Al0.2Co1.5CrFeNi1.5Ti0.5)3O4 by a deoxidation process via a CaH2-assisted molten salt method at 600 °C. X-ray diffraction measurements demonstrated that the oxide precursor and the reduced product have single-phases of spinel structure and face-centered c

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Dong, Qi, Min Hong, Jinlong Gao, et al. "Rapid Synthesis of High‐Entropy Oxide Microparticles." Small 18, no. 11 (2022): 2104761. http://dx.doi.org/10.1002/smll.202104761.

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Vinnik, Trofimov, Zhivulin, et al. "High Entropy Oxide Phases with Perovskite Structure." Nanomaterials 10, no. 2 (2020): 268. http://dx.doi.org/10.3390/nano10020268.

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The possibility of the formation of high entropy single-phase perovskites using solid-state sintering was investigated. The BaO–SrO–CaO–MgO–PbO–TiO2, BaO–SrO–CaO–MgO–PbO–Fe2O3 and Na2O–K2O–CaO–La2O3–Ce2O3–TiO2 oxide systems were investigated. The optimal synthesis temperature is found between 1150 and 1400 °C, at which the microcrystalline single phase with perovskite structure was produced. The morphology, chemical composition, crystal parameters and dielectric properties were studied and compared with that of pure BaTiO3. According to the EDX data, the single-phase product has a formula of N

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Hadraba, Hynek, Zdenek Chlup, Antonin Dlouhy, et al. "Oxide dispersion strengthened CoCrFeNiMn high-entropy alloy." Materials Science and Engineering: A 689 (March 2017): 252–56. http://dx.doi.org/10.1016/j.msea.2017.02.068.

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Mileiko, S. T., S. A. Firstov, N. A. Novokhatskaya, V. F. Gorban, and N. P. Krapivka. "Oxide-fibre/high-entropy-alloy-matrix composites." Composites Part A: Applied Science and Manufacturing 76 (September 2015): 131–34. http://dx.doi.org/10.1016/j.compositesa.2015.05.023.

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Vinnik, D. A., E. A. Trofimov, V. E. Zhivulin, et al. "High-entropy oxide phases with magnetoplumbite structure." Ceramics International 45, no. 10 (2019): 12942–48. http://dx.doi.org/10.1016/j.ceramint.2019.03.221.

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Leong, Zhaoyuan, Pratik Desai, and Nicola Morley. "Can Empirical Biplots Predict High Entropy Oxide Phases?" Journal of Composites Science 5, no. 12 (2021): 311. http://dx.doi.org/10.3390/jcs5120311.

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High entropy oxides are entropy-stabilised oxides that adopt specific disordered structures due to entropy stabilisation. They are a new class of materials that utilises the high-entropy concept first discovered in metallic alloys. They can have interesting properties due to the interactions at the electronic level and can be combined with other materials to make composite structures. The design of new meta-materials that utilise this concept to solve real-world problems may be a possibility but further understanding of how their phase stabilisation is required. In this work, biplots of the co

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Bérardan, D., S. Franger, A. K. Meena, and N. Dragoe. "Room temperature lithium superionic conductivity in high entropy oxides." Journal of Materials Chemistry A 4, no. 24 (2016): 9536–41. http://dx.doi.org/10.1039/c6ta03249d.

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Impedance spectroscopy measurements evidence superionic Li<sup>+</sup> mobility (>10<sup>−3</sup> S cm<sup>−1</sup>) at room temperature and fast ionic mobility for Na<sup>+</sup> (5 × 10<sup>−6</sup> S cm<sup>−1</sup>) in high entropy oxides, a new family of oxide-based materials with the general formula (MgCoNiCuZn)<sub>1−x−y</sub>Ga<sub>y</sub>A<sub>x</sub>O (with A = Li, Na, K).

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Aziz, Saba, Anna Grazia Monteduro, Ritu Rawat, et al. "Preparation and Characterization of BXFO High-Entropy Oxides." Magnetochemistry 10, no. 8 (2024): 60. http://dx.doi.org/10.3390/magnetochemistry10080060.

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Increasing demand for functional materials crucial for advancing new technologies has motivated significant scientific and industrial research efforts. High-entropy materials (HEMs), with tunable properties, are gaining attention for their use in high-frequency transformers, microwave devices, multiferroics, and high-density magnetic memory components. The initial exploration of HEMs started with high-entropy alloys (HASs), such as CrMnFeCoNi, CuCoNiCrAlxFe, and AlCoCrTiZn and paved the way for a multitude of HEM variations, including oxides, oxyfluorides, borides, carbides, nitrides, sulfides

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Liu, Shuai, Kangqi Liu, Liangwen Qi, and Lanjun Yang. "Synthesis of High-Entropy Oxide Nanopowders with Different Crystal Structures by Electrical Explosion of Wires." Nanomaterials 15, no. 8 (2025): 571. https://doi.org/10.3390/nano15080571.

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High-entropy oxides are a new type of material that consists of five or more principal elements in an equimolar or nearly equimolar ratio. They have many excellent properties and are rapidly becoming a hotspot for the development of new high-performance materials. In this study, electrical explosion is used for the first time to synthesize high-entropy oxide nanopowders with different crystal structures. (FeCoNiCrCu)O is the rock salt structure, (FeCoNiCrTi)O is the spinel structure, and (CoNiTiCuZn)O contains the two phases. According to the TEM and EDS results, the distribution of the five m

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Pikalova, Elena Y., Elena G. Kalinina, Nadezhda S. Pikalova, and Elena A. Filonova. "High-Entropy Materials in SOFC Technology: Theoretical Foundations for Their Creation, Features of Synthesis, and Recent Achievements." Materials 15, no. 24 (2022): 8783. http://dx.doi.org/10.3390/ma15248783.

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In this review, recent achievements in the application of high-entropy alloys (HEAs) and high-entropy oxides (HEOs) in the technology of solid oxide fuel cells (SOFC) are discussed for the first time. The mechanisms of the stabilization of a high-entropy state in such materials, as well as the effect of structural and charge factors on the stability of the resulting homogeneous solid solution are performed. An introduction to the synthesis methods for HEAs and HEOs is given. The review highlights such advantages of high-entropy materials as high strength and the sluggish diffusion of component

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Lin, Ling, Kai Wang, Raheleh Azmi, et al. "Mechanochemical synthesis: route to novel rock-salt-structured high-entropy oxides and oxyfluorides." Journal of Materials Science 55, no. 36 (2020): 16879–89. http://dx.doi.org/10.1007/s10853-020-05183-4.

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Abstract A facile mechanochemical reaction at ambient temperature was successfully applied to synthesize novel single-phase rock-salt-structured high-entropy oxides, containing five, six and seven metal elements in equiatomic amounts. This synthesis approach overcomes the limitations of the commonly known synthesis procedures, which would result in multiple-phase compounds. Redox-sensitive elements, such as Fe2+ and Mn2+, can now be considered. The corresponding single-phase Li-containing high-entropy oxyfluorides were obtained by introducing LiF into the lattice using the same strategy. All m

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Roy, Indranil, Pratik K. Ray, and Ganesh Balasubramanian. "Modeling Oxidation of AlCoCrFeNi High-Entropy Alloy Using Stochastic Cellular Automata." Entropy 24, no. 9 (2022): 1263. http://dx.doi.org/10.3390/e24091263.

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Together with the thermodynamics and kinetics, the complex microstructure of high-entropy alloys (HEAs) exerts a significant influence on the associated oxidation mechanisms in these concentrated solid solutions. To describe the surface oxidation in AlCoCrFeNi HEA, we employed a stochastic cellular automata model that replicates the mesoscale structures that form. The model benefits from diffusion coefficients of the principal elements through the native oxides predicted by using molecular simulations. Through our examination of the oxidation behavior as a function of the alloy composition, we

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Arshad, Muhammad, Saira Bano, Mohamed Amer, Vit Janik, Qamar Hayat, and Mingwen Bai. "High-Temperature Oxidation and Phase Stability of AlCrCoFeNi High Entropy Alloy: Insights from In Situ HT-XRD and Thermodynamic Calculations." Materials 17, no. 14 (2024): 3579. http://dx.doi.org/10.3390/ma17143579.

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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 oxi

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Deng, Chang, Peiwen Wu, Linhua Zhu, et al. "High-entropy oxide stabilized molybdenum oxide via high temperature for deep oxidative desulfurization." Applied Materials Today 20 (September 2020): 100680. http://dx.doi.org/10.1016/j.apmt.2020.100680.

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Chen, Tianhui, Zhijiang Bi, Ji Zhou, et al. "Oxidation Behavior of Lightweight Al0.2CrNbTiV High Entropy Alloy Coating Deposited by High-Speed Laser Cladding." Coatings 14, no. 9 (2024): 1104. http://dx.doi.org/10.3390/coatings14091104.

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High-temperature oxidation resistance is the major influence on the high-temperature service stability of refractory high entropy alloys. The oxidation behavior of lightweight Al0.2CrNbTiV refractory high entropy alloy coatings with different dilution ratios at 650 °C and 800 °C deposited by high-speed laser cladding was analyzed in this paper. The oxidation kinetic was analyzed, the oxidation resistance mechanism of the Al0.2CrNbTiV coating was clarified with the analysis of the formation and evolution of the oxidation layer, and the effect of the dilution rate on high-temperature performance

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Edalati, Parisa, Qing Wang, Hadi Razavi-Khosroshahi, Masayoshi Fuji, Tatsumi Ishihara, and Kaveh Edalati. "Photocatalytic hydrogen evolution on a high-entropy oxide." Journal of Materials Chemistry A 8, no. 7 (2020): 3814–21. http://dx.doi.org/10.1039/c9ta12846h.

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38

Wang, Luntao, Sandrine Zanna, Dilitri Mercier, Vincent Maurice, and Philippe Marcus. "Early-stage surface oxidation of the equiatomic CoCrFeMnNi high entropy alloy studied in situ by XPS." Corrosion Science 220 (June 6, 2023): 111310. https://doi.org/10.1016/j.corsci.2023.111310.

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The mechanisms of initial oxide growth on the equiatomic CoCrFeMnNi high entropy alloy were studied <em>in situ</em> by X-ray photoelectron spectroscopy on clean, oxide-free surfaces exposed stepwise to low-pressure gaseous oxygen. Cr(III), Mn(III), Fe(III), Co(II) but no Ni(II) oxides were formed at 100 °C, and Mn(II) at 200 °C. Data quantification revealed a transition mechanism from selective initial oxidation to 3D kinetically-controlled growth, leading to stratification of the oxide film. Formation of the Co-rich outer layer above the Cr-rich inner layer first formed implies predo

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39

Zaitseva, O. V., D. A. Vinnik, and Evgeny A. Trofimov. "The Poly-Substituted M-Type Hexaferrite Crystals Growth." Materials Science Forum 946 (February 2019): 186–91. http://dx.doi.org/10.4028/www.scientific.net/msf.946.186.

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In the presented article the possibility analysis of highly entropic oxide phases composition and structure formation was performed. Moreover, the studies devoted to the production of substituted single crystals with the M-type hexa-ferrite structure were carried out. The experiments were conducted to studying the possibility of obtaining oxide high-entropy crystalline solid solutions with the M-type hexa-ferrites structure. As the result of the crystallized samples investigation, the microcrystalline highly entropic Ba (Fe,Mn,Ni,Ti,Al)12O19 and (Ba,Pb,Sr)(Fe,Mn,Ti,Ni,Al)12O19 phases appearing

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40

Csík, D., D. Zalka, K. Saksl, D. Capková, and R. Džunda. "Four-component high entropy spinel oxide as anode material in lithium-ion batteries with excellent cyclability." Journal of Physics: Conference Series 2382, no. 1 (2022): 012003. http://dx.doi.org/10.1088/1742-6596/2382/1/012003.

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Nowadays, energy storage technologies are in focus of public interest, especially in the field of the automotive industry. Lithium-ion batteries (LIBs) are evaluated as one of the most advanced energy storage devices because of their high energy density, which can meet rapidly growing energy requirements. Graphite based anode materials in LIBs are reaching their fundamental limits, especially their specific capacities. Recently, it has been demonstrated that high entropy oxides (HEOs) possess promising and unexpected electrochemical properties, such as remarkable reversible capacity and cycle

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41

Yurchenko, Nikita, Evgeniya Panina, Sergey Zherebtsov, Gennady Salishchev, and Nikita Stepanov. "Oxidation Behavior of Refractory AlNbTiVZr0.25 High-Entropy Alloy." Materials 11, no. 12 (2018): 2526. http://dx.doi.org/10.3390/ma11122526.

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Oxidation behavior of a refractory AlNbTiVZr0.25 high-entropy alloy at 600–900 °C was investigated. At 600–700 °C, two-stage oxidation kinetics was found: Nearly parabolic oxidation (n = 0.46–0.48) at the first stage, transitioned to breakaway oxidation (n = 0.75–0.72) at the second stage. At 800 °C, the oxidation kinetics was nearly linear (n = 0.92) throughout the entire duration of testing. At 900 °C, the specimen disintegrated after 50 h of testing. The specific mass gains were estimated to be 7.2, 38.1, and 107.5, and 225.5 mg/cm2 at 600, 700, and 800 °C for 100 h, and 900 °C for 50 h, re

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42

Shi, Yunzhu, Rui Li, and Zhifeng Lei. "Influences of Synthetic Parameters on Morphology and Growth of High Entropy Oxide Nanotube Arrays." Coatings 13, no. 1 (2022): 46. http://dx.doi.org/10.3390/coatings13010046.

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Nanoscale and nanostructured materials have drawn great attention owing to their outstanding and unique properties. Enlightened by the study of “entropy-stabilized oxides”, nanotubes consisting of multi-component mixed metal oxides are developed, which formed on equi-atomic TiZrHfNbTa high-entropy alloy (HEA). However, the growth mechanism and how the oxidation conditions influence the nanotube growth and morphology remains unknown. In the present study, by controlling the anodization parameters (applied voltages and time) and bath compositions (fluoride concentration and water content), scann

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43

Liu, Bu-Jine, Tai-Hsin Yin, Yu-Wei Lin, et al. "A Cost-Effective, Nanoporous, High-Entropy Oxide Electrode for Electrocatalytic Water Splitting." Coatings 13, no. 8 (2023): 1461. http://dx.doi.org/10.3390/coatings13081461.

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High-entropy materials have attracted extensive attention as emerging electrode materials in various energy applications due to their flexible tunability, unusual outstanding activities, and cost-effectiveness using multiple earth-abundant elements. We introduce a novel high-entropy composite oxide with the five elements of Cu, Ni, Co, Fe, and Cr (HEO-3CNF) for use in the oxygen evolution reaction (OER) in electrocatalytic water splitting. HEO-3CNF is composed of two phases with a non-equimolar, deficient high-entropy spinel oxide of (Cu0.2−xNi0.2Co0.2Fe0.2Cr0.2)3O4 and monoclinic copper oxide

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44

Guo, Hui-Xia, Wei-Ming Wang, Cheng-Yu He, et al. "Entropy-Assisted High-Entropy Oxide with a Spinel Structure toward High-Temperature Infrared Radiation Materials." ACS Applied Materials & Interfaces 14, no. 1 (2021): 1950–60. http://dx.doi.org/10.1021/acsami.1c20055.

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45

Sun, Zheng, Yongjie Zhao, Chen Sun, Qing Ni, Chengzhi Wang, and Haibo Jin. "High entropy spinel-structure oxide for electrochemical application." Chemical Engineering Journal 431 (March 2022): 133448. http://dx.doi.org/10.1016/j.cej.2021.133448.

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46

Phakatkar, Abhijit, Reza Shahbazian-Yassar, and Tolou Shokuhfar. "STEM-EELS Analysis of High Entropy Oxide Nanoparticles." Microscopy and Microanalysis 27, S1 (2021): 884–86. http://dx.doi.org/10.1017/s1431927621003421.

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47

Webb, Matthew, Mike Gerhart, Steven Baksa, et al. "High temperature stability of entropy-stabilized oxide (MgCoNiCuZn)0.2O in air." Applied Physics Letters 124, no. 15 (2024). http://dx.doi.org/10.1063/5.0199076.

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Entropy-stabilized oxides are single-phase, multicomponent oxides that are stabilized by a large entropy of mixing, ΔS, overcoming a positive enthalpy. Due to the −TΔS term in the Gibbs' free energy, G, it can be hypothesized that entropy-stabilized oxides demonstrate a robust thermal stability. Here, we investigate the high temperature stability (1300–1700 °C) of the prototypical entropy-stabilized rocksalt oxide (MgCoNiCuZn)0.2O in air. We find that at temperatures &gt;1300 °C, the material gradually loses Cu and Zn with increasing temperature. Cu is lost through a selective melting as a

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48

Liu, Yifan, Caichao Ye, Long Chen, et al. "High Entropy‐Driven Role of Oxygen Vacancies for Water Oxidation." Advanced Functional Materials, January 30, 2024. http://dx.doi.org/10.1002/adfm.202314820.

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AbstractOxygen vacancy engineering is a promising strategy to enhance the electrocatalytic activities in conventional metal oxide electrocatalysts. However, the utilization of oxygen vacancies in high‐entropy oxides remains unknown, primarily due to the challenges associated with facile introduction of the oxygen vacancies and explanation of their roles in complex high‐entropy systems. Herein, the facile introduction of oxygen vacancies into high‐entropy oxides is realized and the unique high entropy‐driven role of oxygen vacancies for oxygen evolution reaction (OER) process is revealed. A low

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49

Kala, Jyotsana, Vicky Dhongde, Subhrajyoti Ghosh, et al. "In silico design and experimental validation of a high-entropy perovskite oxide for SOFC cathodes." Journal of Materials Chemistry A, 2025. https://doi.org/10.1039/d4ta08251f.

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High entropy perovskite oxides have the potential to significantly enhance electrode performance in solid oxide fuel cells (SOFCs) and batteries. However, not all high entropy configurations yield single-phase perovskite oxides....

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50

Porodko, Olena, Ladislav Kavan, Martin Fabian, et al. "Preparation of novel lithiated high-entropy spinel-type oxyhalides and their electrochemical performance in Li-ion batteries." Nanoscale, 2025. https://doi.org/10.1039/d4nr03918a.

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Compositionally complex doping of spinel oxides toward high-entropy oxides is expected to enhance their electrochemical performance substantially. We successfully prepared high-entropy compounds, i.e., the oxide (Zn0.25Mg0.25Co0.25Cu0.25)Fe2O4 (HEOFe), lithiated oxyfluoride Li0.5(Zn0.25Mg0.25Co0.25Cu0.25)0.5Fe2O3.5F0.5...

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