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Ultrafast high-temperature synthesis of bulk high-entropy oxide glasses.

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Title:	Ultrafast high-temperature synthesis of bulk high-entropy oxide glasses.
Authors:	Liang, Yihan¹ (AUTHOR), Zhang, Hao¹ (AUTHOR), Cao, Lei¹ (AUTHOR), Wen, Bo¹ (AUTHOR), Liu, Yijiang¹ (AUTHOR), Xiao, Liang¹ (AUTHOR), Jiang, Man¹ (AUTHOR), Feng, Qingguo¹ (AUTHOR), Hu, Chunfeng¹ (AUTHOR) chfhu@live.cn
Source:	Ceramics International. Dec2025:Part C, Vol. 51 Issue 29, p61995-62003. 9p.
Subjects:	Amorphization, Chemical synthesis, Optical properties, Mechanical behavior of materials, Materials science, Thermal stability, Phase transitions
Abstract:	High-entropy oxide glasses (HEOGs) offer superior mechanical and optical properties. However, their synthesis via conventional crucible melt-quenching method is challenged by their high melting points and strong crystallization tendencies. Here, we report the synthesis of La-Y-Ti-Zr-Al-O HEOGs in just 9–15 s using ultrafast high-temperature synthesis (UHS). Through interrupted quenching experiments, the amorphization, compositional evolution, and phase transformation of HEOGs during the UHS process were investigated. The UHS-prepared glasses are fully amorphous and compositionally homogeneous, exhibiting excellent mechanical properties, including high hardness (∼9.07 GPa) and superior fracture toughness (∼1.57 MPa m1/2), and high thermal stability comparable to those produced by the state-of-the-art aerodynamic levitation (ADL) technique. Notably, the reducing environment of UHS induces lower-valent cations (such as Ti3+) and oxygen-deficient centers in HEOGs, resulting in a unique black appearance and strong broadband absorption across the ultraviolet, visible, and near-infrared spectrum. This work clarifies the link between UHS process characteristics, defect chemistry, and the sample properties, offering a viable route for the rapid preparation of high-performance HEOGs. [ABSTRACT FROM AUTHOR]
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Database:	Engineering Source

Description
Abstract:	High-entropy oxide glasses (HEOGs) offer superior mechanical and optical properties. However, their synthesis via conventional crucible melt-quenching method is challenged by their high melting points and strong crystallization tendencies. Here, we report the synthesis of La-Y-Ti-Zr-Al-O HEOGs in just 9–15 s using ultrafast high-temperature synthesis (UHS). Through interrupted quenching experiments, the amorphization, compositional evolution, and phase transformation of HEOGs during the UHS process were investigated. The UHS-prepared glasses are fully amorphous and compositionally homogeneous, exhibiting excellent mechanical properties, including high hardness (∼9.07 GPa) and superior fracture toughness (∼1.57 MPa m1/2), and high thermal stability comparable to those produced by the state-of-the-art aerodynamic levitation (ADL) technique. Notably, the reducing environment of UHS induces lower-valent cations (such as Ti3+) and oxygen-deficient centers in HEOGs, resulting in a unique black appearance and strong broadband absorption across the ultraviolet, visible, and near-infrared spectrum. This work clarifies the link between UHS process characteristics, defect chemistry, and the sample properties, offering a viable route for the rapid preparation of high-performance HEOGs. [ABSTRACT FROM AUTHOR]
ISSN:	02728842
DOI:	10.1016/j.ceramint.2025.10.417