A novel high-entropy monoboride (Mo0.2Ta0.2Ni0.2Cr0.2W0.2)B with superhardness and low thermal conductivity

Zhao, Pengbo; Zhu, Jinpeng; Zhang, Yilin; Shao, Gang; Wang, Hailong; Li, Mingliang; Li, Wen; Fan, Bingbing; Xu, Hongliang; Lu, Hongxia; Zhou, Yanchun; Zhang, Rui

doi:10.1016/j.ceramint.2020.07.131

Cited by 69 publications

(20 citation statements)

References 43 publications

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“…Solid state reaction synthesis is the most commonly used method for the preparation of HECs, which is suitable to not only oxides but also silicates, borides, carbides, silicide carbides, and sulfides [32,58,67,80,85,88,95,96,99,101,[109][110][111]. For example, Chen et al [90] High-entropy borides and carbides can also be synthesized using the solid state reaction method.…”

Section: Synthesis Methodsmentioning

confidence: 99%

“…These materials often possess enhanced hardness, ultralow thermal conductivity compared to their binary constituents, which make them suitable for extreme environment applications. Other than materials with simple structures, high-entropy materials with relatively complex and lowsymmetry structure are also fabricated recently, such as monosilicates [43,85,86], disilicates [87][88][89], aluminates [23,90,91], phosphates [92,93], magnetoplumbites [94], monoborides [95][96][97], hexaborides [98,99], tetraborides [100], silicide carbides [101], and silicides [33,102], which have enriched our knowledge on the HECs, as shown in Table 1.…”

Section: Electronic Structure and Band Gap Engineeringmentioning

confidence: 99%

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High-entropy ceramics: Present status, challenges, and a look forward

et al. 2021

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High-entropy ceramics (HECs) are solid solutions of inorganic compounds with one or more Wyckoff sites shared by equal or near-equal atomic ratios of multi-principal elements. Although in the infant stage, the emerging of this new family of materials has brought new opportunities for material design and property tailoring. Distinct from metals, the diversity in crystal structure and electronic structure of ceramics provides huge space for properties tuning through band structure engineering and phonon engineering. Aside from strengthening, hardening, and low thermal conductivity that have already been found in high-entropy alloys, new properties like colossal dielectric constant, super ionic conductivity, severe anisotropic thermal expansion coefficient, strong electromagnetic wave absorption, etc., have been discovered in HECs. As a response to the rapid development in this nascent field, this article gives a comprehensive review on the structure features, theoretical methods for stability and property prediction, processing routes, novel properties, and prospective applications of HECs. The challenges on processing, characterization, and property predictions are also emphasized. Finally, future directions for new material exploration, novel processing, fundamental understanding, in-depth characterization, and database assessments are given.

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Section: Synthesis Methodsmentioning

confidence: 99%

Section: Electronic Structure and Band Gap Engineeringmentioning

confidence: 99%

High-entropy ceramics: Present status, challenges, and a look forward

et al. 2021

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“…High-entropy ceramics (HECs), including rocksalt [1], perovskite [2], fluorite [3], and pyrochlore [4,5] oxides, borides [6,7], carbides [8][9][10][11], and silicides [12,13] have attracted great research interests. Recently, it is further proposed to broaden HECs to compositionally-complex ceramics (CCCs) [14][15][16].…”

Section: Introductionmentioning

confidence: 99%

Single-phase duodenary high-entropy fluorite/pyrochlore oxides with an order-disorder transition

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et al. 2021

Acta Materialia

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“…For instance, Yan et al 49 . discovered that thermal conductivity of (Ti 0.2 Zr 0.2 Hf 0.2 Nb 0.2 Ta 0.2 )C ceramic (93% relative density) at room temperature is 6.45 W/m K, and Zhao et al 50 . observed that the thermal conductivity of (Mo 0.2 Ta 0.2 Ni 0.2 Cr 0.2 W 0.2 )B ceramic (97.87% relative density) is 2.05 ± 0.10 W/m K at 400°C.…”

Section: Resultsmentioning

confidence: 99%

“…The phenomenon of reduction of thermal conductivity for other high-entropy materials has been observed in experiments. For instance, Yan et al 49 discovered that thermal conductivity of (Ti 0.2 Zr 0.2 Hf 0.2 Nb 0.2 Ta 0.2 )C ceramic (93% relative density) at room temperature is 6.45 W/m K, and Zhao et al 50 observed that the thermal conductivity of (Mo 0.…”

Section: Dft Calculated Thermodynamic Properties Of Heb-hftimotanbmentioning

confidence: 99%

Low‐temperature synthesis of high‐entropy (Hf_0.2Ti_0.2Mo_0.2Ta_0.2Nb_0.2)B₂ powders combined with theoretical forecast of its elastic and thermal properties

et al. 2022

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A theoretical calculation combined with experiment was used to study highentropy (Hf 0.2 Ti 0.2 Mo 0.2 Ta 0.2 Nb 0.2 )B 2 (HEB-HfTiMoTaNb). The theoretical calculation suggested HEB-HfTiMoTaNb could be stable over a wide temperature range. Then, a novel solvothermal/molten salt-assisted borothermal reduction method was proposed to efficiently pre-disperse transitional metal atoms in a precursor and synthesize (Hf 0.2 Ti 0.2 Mo 0.2 Ta 0.2 Nb 0.2 )B 2 nanoscale powders at 1573 K for 6 h, which is nearly 300 K lower than previous reports. The characterization results indicated that the as-synthesized nanoscale HEB-HfTiMoTaNb powder was hexagonal single-phase with homogeneous elements distribution and uniform size, and the oxygen content of the particles is 0.97 wt%. Simultaneously, the mechanical properties, anisotropic nature, and thermal properties of HEB-HfTiMoTaNb were investigated by density functional theory (DFT) calculations. The Cannikin's law was adopted to explain the improvement of comprehensive mechanical properties. In addition, a significant reduction of thermal conductivity was observed for HEB-HfTiMoTaNb and it only was 1/15 of the value of HfB 2 . This work suggests a reliable technique for synthesis of nanosized HEB powders and discovery of high-entropy materials under the guidance of first-principle theory.

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A novel high-entropy monoboride (Mo0.2Ta0.2Ni0.2Cr0.2W0.2)B with superhardness and low thermal conductivity

Cited by 69 publications

References 43 publications

High-entropy ceramics: Present status, challenges, and a look forward

High-entropy ceramics: Present status, challenges, and a look forward

Single-phase duodenary high-entropy fluorite/pyrochlore oxides with an order-disorder transition

Low‐temperature synthesis of high‐entropy (Hf_0.2Ti_0.2Mo_0.2Ta_0.2Nb_0.2)B₂ powders combined with theoretical forecast of its elastic and thermal properties

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A novel high-entropy monoboride (Mo0.2Ta0.2Ni0.2Cr0.2W0.2)B with superhardness and low thermal conductivity

Cited by 69 publications

References 43 publications

High-entropy ceramics: Present status, challenges, and a look forward

High-entropy ceramics: Present status, challenges, and a look forward

Single-phase duodenary high-entropy fluorite/pyrochlore oxides with an order-disorder transition

Low‐temperature synthesis of high‐entropy (Hf0.2Ti0.2Mo0.2Ta0.2Nb0.2)B2 powders combined with theoretical forecast of its elastic and thermal properties

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Low‐temperature synthesis of high‐entropy (Hf_0.2Ti_0.2Mo_0.2Ta_0.2Nb_0.2)B₂ powders combined with theoretical forecast of its elastic and thermal properties