High-entropy R2O3-Y2O3-TiO2-ZrO2-Al2O3 glasses with ultrahigh hardness, Young's modulus, and indentation fracture toughness

Guo, Yongchang; Li, Jianqiang; Zhang, Ying; Feng, Shaowei; Sun, Hong

doi:10.1016/j.isci.2021.102735

Cited by 46 publications

(13 citation statements)

References 54 publications

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“…These are larger than those of SiO 2 (68.8 kJ/cm 3 ) and B 2 O 3 (86.0 kJ/cm 3 ) 7 . In addition, it has been reported that high field ions can induce the transformation of Al 3+ into a higher coordination number 8,13,16 . In aluminosilicate glasses, which typically range from 3% to 30% and from 1% to 2%, respectively, 17 these high‐entropy glasses reach values near 41.9% and 14.0% 8 .…”

Section: Resultsmentioning

confidence: 99%

“…11 The "cocktail" effect of high entropy has led to unexpected improvements in performance. 12 A prime example of this innovative approach is the high-entropy glass created by Li et al, composed of 18.77R 2 O 3 -4.83Y 2 O 3 -28.22TiO 2 -8.75ZrO 2 -39.43Al 2 O 3 , 13 which achieves a Young's modulus of 177.9 GPa. However, the refractive index remains below 2.0.…”

Section: Introductionmentioning

confidence: 99%

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High‐refraction index glasses with ultra‐high Young's modulus and high hardness fabricated by containerless processing

Ma,

Yu,

et al. 2023

J Am Ceram Soc.

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High‐refractive index glasses with ultra‐high Young's modulus and superior hardness have significant application in optical lenses. Research indicates that high‐entropy glasses, enriched with high dissociation energy and high‐field strength components, enhance the mechanical properties of glass. In this study, we tailored high‐entropy glasses to achieve superior optical and mechanical attributes by optimizing heavy metal oxide components and adjusting the Al2O3 content. The resultant 10RE2O3‐10Gd2O3‐32Al2O3‐36Ta2O5‐12ZrO2 (RE = La, Tm, Lu) glass demonstrates a refractive index of 2.028, a Young's modulus of 186.2 GPa, and a Vickers hardness of 9.18 GPa. The glass was colorless and widely transparent, in the visible‐to‐infrared region from 312.5 to 6674 nm, and the maximum transmittance reach up to 79.3%. These results indicate that the 10RE2O3‐10Gd2O3‐32Al2O3‐36Ta2O5‐12ZrO2 glass would be useful for camera and detector lenses.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

High‐refraction index glasses with ultra‐high Young's modulus and high hardness fabricated by containerless processing

Ma,

Yu,

et al. 2023

J Am Ceram Soc.

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“…[159,160] Recently, the mixing of five or more oxide components (to achieve so-called "high-entropy" materials) has also been proposed for glasses, demonstrating the containerless synthesis of a (La,Sm,Gd) 2 O 3 -Y 2 O 3 -TiO 2 -ZrO 2 -Al 2 O 3 glass with high hardness (>12 GPa) and high Young's modulus (>170 GPa). [161] For such ultrastiff glasses (which usually rely on heavy loading of rare earth oxides), it is challenging is to adapt their composition in such a way that larger glass objects can be produced. It typically means that the number of chemical components must be increased, for example, such as in the popular alkaline earth aluminosilicate glasses, which may accommodate high amounts of rare earth doping and still be meltable by regular laboratory techniques.…”

Section: Oxide Glasses From the Bottom-upmentioning

confidence: 99%

“…Copyright 2018, Elsevier and Reproduced with permission [207]. Copyright 2018, Elsevier), and Reproduced with permission under the terms of a Creative Commons Attribution License (CC BY-NC-ND 4.0) [161]. Copyright 2021, The Authors, published by AAAS.…”

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confidence: 99%

Advancing the Mechanical Performance of Glasses: Perspectives and Challenges

et al. 2022

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in terms of deciphering structure-property relationships and the nonaffine nature of glass mechanical behavior, of computational and computer-assisted methods for accelerated materials discovery, and of physicochemical insight at glass formation and synthesis in unconventional types of materials. Despite this progress, significant questions remain as to the fundamental role of structural heterogeneity and its consequences for the predictability of mechanical properties underlying the many applications of glass. Today's challenge is to translate new understanding of the physics of disorder, glass chemistry, and surface mechanics into tools that enable future glass products with adapted elasticity, strength, and toughness. We will therefore consider fundamental advances in relation to emerging glass applications. While the aforementioned physical insights have mostly been obtained by computational simulation of model systems, and often through the examination of metallic glasses, we will here focus on glasses suitable for visible transparency, in particular silicate glasses, such as a representative of today's most prolific glass devices, ranging from ultrathin substrates to strong and visually transparent cover materials. We will further consider hybrid glasses and glass-like composite materials as emerging alternatives that may overcome the ubiquitous conflict between strength and toughness. [1] Glasses are materials that lack a crystalline microstructure and long-range atomic order. Instead, they feature heterogeneity and disorder on superstructural scales, which have profound consequences for their elastic response, material strength, fracture toughness, and the characteristics of dynamic fracture. These structure-property relations present a rich field of study in fundamental glass physics and are also becoming increasingly important in the design of modern materials with improved mechanical performance. A first step in this direction involves glass-like materials that retain optical transparency and the haptics of classical glass products, while overcoming the limitations of brittleness. Among these, novel types of oxide glasses, hybrid glasses, phase-separated glasses, and bioinspired glass-polymer composites hold significant promise. Such materials are designed from the bottom-up, building on structure-property relations, modeling of stresses and strains at relevant length scales, and machine learning predictions. Their fabrication requires a more scientifically driven approach to materials design and processing, building on the physics of structural disorder and its consequences for structural rearrangements, defect initiation, and dynamic fracture in response to mechanical load. In this article, a perspective is provided on this highly interdisciplinary field of research in terms of its most recent challenges and opportunities.The ORCID identification number(s) for the author(s) of this article can be found under https://doi.org/10.1002/adma.202109029.

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“…Recently, the highest Young's modulus of 171 GPa and Vickers hardness of 13 GPa, measured using a nanoindenter method, have been reported for high entropy oxide glasses prepared using a levitation technique. 115) Note that Young's modulus and other mechanical properties often strongly depend on measurement methods.…”

Section: High Hardnessmentioning

confidence: 99%

Functionalities in unconventional oxide glasses prepared using a levitation technique

Masuno

2022

J. Ceram. Soc. Japan

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Over the last 20 years, many unconventional oxide glasses have been fabricated in bulk using a levitation technique. These glasses contain no or less network-former oxides; thus, they have been supposed not to vitrify so far. The levitation technique could vitrify them because the levitated melt was maintained without touching anything; thus, crystal nucleation was extremely suppressed. This review presents a brief introduction to the levitation technique. It also summarizes some functionalities that emerged in the glasses prepared using this technique, such as high refractive index, infrared transparency, strong luminescence, large magneto-optical effect, high elastic moduli, and crack resistance.

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High-entropy R2O3-Y2O3-TiO2-ZrO2-Al2O3 glasses with ultrahigh hardness, Young's modulus, and indentation fracture toughness

Cited by 46 publications

References 54 publications

High‐refraction index glasses with ultra‐high Young's modulus and high hardness fabricated by containerless processing

High‐refraction index glasses with ultra‐high Young's modulus and high hardness fabricated by containerless processing

Advancing the Mechanical Performance of Glasses: Perspectives and Challenges

Functionalities in unconventional oxide glasses prepared using a levitation technique

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