High‐entropy transparent fluoride laser ceramics

Chen, Xianqiang; Wu, Yiquan

doi:10.1111/jace.16842

Cited by 88 publications

(45 citation statements)

References 42 publications

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“…HEAs, which are more broadly defined as "complexconcentrated or compositionally-complex alloys (CCAs)", have shown excellent, often unexpected, mechanical and physical properties [3]. In last five years, highentropy ceramics (HECs), including high-entropy oxides [4][5][6][7], borides [8][9][10], carbides [11][12][13], silicides [14,15], and fluorides [16], have been synthesized in the bulk form as the ceramic counterparts to HEAs. Recently, it was proposed to generalize HECs to "compositionallycomplex ceramics (CCCs)", where medium-entropy and/or non-equimolar compositions can outperform their high-entropy counterparts [17,18].…”

Section: Introduction mentioning

confidence: 99%

A new class of high-entropy M3B4 borides

et al. 2020

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A new class of high-entropy M3B4 borides of the Ta3B4-prototyped orthorhombic structure has been synthesized in the bulk form for the first time. Specimens with compositions of (V0.2Cr0.2Nb0.2Mo0.2Ta0.2)3B4 and (V0.2Cr0.2Nb0.2Ta0.2W0.2)3B4 were fabricated via reactive spark plasma sintering of high-energy-ball-milled elemental boron and metal precursors. The sintered specimens were ∼98.7% in relative densities with virtually no oxide contamination, albeit the presence of minor (4–5 vol%) secondary high-entropy M5B6 phases. Despite that Mo3B4 or W3B4 are not stable phase, 20% of Mo3B4 and W3B4 can be stabilized into the high-entropy M3B4 borides. Vickers hardness was measured to be 18.6 and 19.8 GPa at a standard load of 9.8 N. This work has further expanded the family of different structures of high-entropy ceramics reported to date.

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Section: Introduction mentioning

confidence: 99%

A new class of high-entropy M3B4 borides

et al. 2020

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“…In addition to two major classes high-entropy UHTCs (discussed above) that have been extensively studied in the last a few years, high-entropy nitrides [67], silicides [44,45], sulfides [98], fluorides [99], aluminides [43], hexaborides [100], carbonitrides [101], and aluminosilicides [38] have been fabricated. In the broader families of oxide-related HECs, the fabrication of high-entropy magnetoplumbites [87,102], zeolitic imidazolate frameworks [103], ferrites [104], phosphates [18,105], monosilicates [19,20], disilicates [106], and metal oxide nanotube arrays [107] have been reported.…”

Section: Graphical Abstractmentioning

confidence: 99%

A step forward from high-entropy ceramics to compositionally complex ceramics: a new perspective

2020

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High-entropy ceramics (HECs) have quickly gained attention since 2015. To date, nearly all work has focused on five-component, equimolar compositions. This perspective article briefly reviews different families of HECs and selected properties. Following a couple of our most recent studies, we propose a step forward to expand HECs to Compositionally Complex ceramics (CCCs) to include medium-entropy and non-equimolar compositions. Using defective fluorite and ordered pyrochlore oxides as two primary examples, we further consider the complexities of aliovalent cations and anion vacancies as well as ordered structures with two cation sublattices.Better thermally-insulating yet stiff CCCs have been found in non-equimolar compositions with optimal amounts of oxygen vacancies and in ordered pyrochlores with substantial size disorder.It is demonstrated that medium-entropy ceramics (MECs) can prevail over their high-entropy counterparts. The diversifying classes of CCCs provide even more possibilities than HECs to tailor the composition, defects, disorder/order, and, consequently, various properties.

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“…High entropy fluoride laser ceramics, with composition of CeNdCaSrBaF 12 (CNCSBF), were prepared by using vacuum hot pressing (VHP) process. 122 CNCSBF nanosized powder was synthesized by using a chemical co-precipitation process. The fluoride had a single phase, containing Ce 3þ , Nd 3þ , Ca 2þ , Sr 2þ and Ba 2þ , with lattice parameter of 0.5826 nm.…”

Section: Transparent Ceramics With Fluorite Structurementioning

confidence: 99%

An overview on transparent ceramics with pyrochlore and fluorite structures

Liu

Xiang

et al. 2020

J. Adv. Dielect.

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Transparent ceramics have potential applications in various areas, including aerospace, relativistic optics industries, medical cares and defense. Specifically, they can be used as laser gain media, armor windows, IR domes, solid-state phosphors, scintillators and electro-optical components. From crystal structure point of view, transparent ceramic materials should have high crystallographic symmetries (cubic, tetragonal and hexagonal), which have minimal birefringent effect. Currently, transparent ceramics are dominantly based on oxide materials, although there are also nonoxides, such as fluorides and nitrides (oxynitrides). Transparent ceramics with pyrochlore and fluorite structures have attracted much attention in recent years, whereas fluorides are not well described in the open literature. Therefore, this paper is aimed to deliver an overview on the progress of the two categories of transparent ceramics, from material processing and characterization point of view.

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High‐entropy transparent fluoride laser ceramics

Cited by 88 publications

References 42 publications

A new class of high-entropy M3B4 borides

A new class of high-entropy M3B4 borides

A step forward from high-entropy ceramics to compositionally complex ceramics: a new perspective

An overview on transparent ceramics with pyrochlore and fluorite structures

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