Bulk high-entropy hexaborides

Qin, Mingde; Yan, Qizhang; Liu, Yi; Wang, Haoren; Wang, Chunyang; Lei, Tianjiao; Vecchio, Kenneth S.; Xin, Huolin L.; Rupert, Timothy J.; Luo, Jian

doi:10.1016/j.jeurceramsoc.2021.05.027

Cited by 29 publications

(8 citation statements)

References 52 publications

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“…Table 2 presents the Vickers hardness, elastic modulus, and fracture toughness of the as-fabricated HEReB 6 -1 samples at 1,673 K, as well as the four individual ReB 6 samples. It was clearly seen that the Vickers hardness and elastic modulus of the HEReB 6 -1 samples were 23.4 ± 0.4 GPa and 261 ± 13 GPa, respectively, which were significantly greater than the average values (18.3 GPa and 232 GPa, respectively) of the four individual ReB 6 samples and those reported for HEReB 6 [20] , as listed in Table 2 . This could be contributed to solid-solution and grain-refinement strengthening effects.…”

Section: Resultsmentioning

confidence: 61%

“…Therefore, the development of high-entropy borides is very attractive to the scientific community. To date, a variety of high-entropy borides, including high-entropy monoborides [ 16 , 17 ], diborides [6] , [7] , [8] , tetraborides [18] , and hexaborides [ 19 , 20 ], have been shown to possess an enhanced mechanical performance, making them promising candidates for structural applications. Nevertheless, to the best of our knowledge, there have been few reports on high-entropy borides with combined structural and functional performance, especially in extreme environments.…”

Section: Introductionmentioning

confidence: 99%

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Nanocrystalline high-entropy hexaboride ceramics enable remarkable performance as thermionic emission cathodes

Yang

Meng

et al. 2023

Fundamental Research

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Section: Resultsmentioning

confidence: 61%

Section: Introductionmentioning

confidence: 99%

Nanocrystalline high-entropy hexaboride ceramics enable remarkable performance as thermionic emission cathodes

Yang

Meng

et al. 2023

Fundamental Research

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“…Since their discovery in 2016, high-entropy borides, as inorganic compound solid solutions with one or more Wyckoff sites shared by no less than four principal elements, have received significant attention due to their vast composition space, diverse microstructures, and adjustable performances. [1][2][3] To date, different types of high-entropy borides, such as high-entropy monoborides, 4,5 highentropy diborides (HEB 2 ), [6][7][8][9][10][11][12] and high-entropy hexaborides (HEB 6 ), [13][14][15] have been investigated to show improved mechanical properties, amorphous-like thermal conductivity, enhanced oxidation resistance, and exceptional electromagnetic and electrochemical properties compared to their individual boride components, which are promising in structural and functional applications, especially in extreme environments. Among them, HEB 6 have been considered the most promising candidates for functional applications at elevated temperatures, such as electron emitters, electrocatalysis, single-photon detectors, and superconductors, beneficial from their low work function (Φ), low volatility at elevated temperatures, and good chemical resistance.…”

Section: Introductionmentioning

confidence: 99%

Accelerating the discovery of high‐entropy hexaborides by data‐driven prediction: From equimolar to non‐equimolar

Meng,

Tang,

Bai

et al. 2024

J Am Ceram Soc.

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Estimating the synthesizability is the prerequisite to discovering novel high‐entropy ceramics with exotic properties. Herein, combined with the high‐throughput experiments and machine learning (ML) methods, the synthesizability of high‐entropy hexaborides (HEB6) is investigated. To construct the database, 100 equimolar quinary HEB6 samples synthesized using a self‐developed high‐throughput solid‐state reaction technique and 20 potential synthesizability descriptors calculated from fundamental parameters of constituent precursors are simultaneously collected. By employing the ML and the genetic algorithms, an optimal model consisting of five synthesizability descriptors (, , , , and ) is determined for predicting the synthesizability of equimolar HEB6 with a high validation accuracy (93.0%), and 7 005 new equimolar quinary HEB6 are then proposed. Moreover, the applicability of our established model on non‐equimolar HEB6 is explored by the prediction of 30 synthesizability diagrams of non‐equimolar quinary HEB6. A high accuracy of 90.9% is further validated by the synthesis experiments of 11 non‐equimolar HEB6 candidates. Our work establishes an effective ML model for assessing the synthesizability of both equimolar and non‐equimolar HEB6 and paves a promising way to accelerate the discovery of new synthetic accessible high‐entropy ceramics.

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“…Since 2015, when Rost et al published their pioneering work on complex oxide solid solutions, 1 high entropy ceramics have attracted growing scientific and technological interest. 2–6 Despite several works focused on various crystal structures and compositions, including various oxides, 1,7–15 carbides, 16–18 silicide, 19 nitrides, 20,21 borides 22,23 and carbonitrides, 24 high-entropy rock salt oxides remain by far the most studied system.…”

Section: Introductionmentioning

confidence: 99%