View in EDS

(La0.2Sm0.2Gd0.2Y0.2Yb0.2)3Nb0.5Ta0.5O7: Novel High-Entropy Oxide for Thermal Barrier Coatings.

Saved in:
Bibliographic Details
Title: (La0.2Sm0.2Gd0.2Y0.2Yb0.2)3Nb0.5Ta0.5O7: Novel High-Entropy Oxide for Thermal Barrier Coatings.
Authors: Hu, Renxi1 (AUTHOR), Zhang, Hongsong2 (AUTHOR) zhsandchen@126.com, Guohua, Ye3 (AUTHOR), Fan, Bingbing4 (AUTHOR), Zhang, Haoming2 (AUTHOR), Guan, Keke2 (AUTHOR), Wang, Chenglong2 (AUTHOR), Ni, Liwei2 (AUTHOR), Wang, Mingfei2 (AUTHOR), Liu, Kun2 (AUTHOR), Li, HaiGuang2 (AUTHOR)
Source: Journal of Materials Engineering & Performance. May2026, Vol. 35 Issue 20, p20196-20203. 8p.
Subjects: Thermal barrier coatings, Pyrochlore, Thermal conductivity, Microhardness, Thermal stability, Elastic modulus, Oxides, Thermal expansion
Abstract: The (La0.2Sm0.2Gd0.2Y0.2Yb0.2)3Nb0.5Ta0.5O7 was designed and synthesized adopting chemical method and high-temperature calcining technique. Its phase structure, micromorphology, element content and type, and thermophysical and mechanical performances were studied. The final conclusions indicate that the achieved high-entropy compound has a sole pyrochlore lattice, dense microstructure and mean distribution of element. Because of the aggravated phonon scattering caused by the substitutional cations, oxygen vacancies and lattice distortion, its room and high-temperature thermal conductivities were less than that of Y2O3 stabilized zirconia (YSZ). The high-entropy compound also exhibits a great thermal expansion coefficient and phase steadiness until 1200 °C, its elastic modulus was higher than that of YSZ, while its fracture toughness and microhardness were smaller than corresponding values of YSZ. [ABSTRACT FROM AUTHOR]
Copyright of Journal of Materials Engineering & Performance is the property of Springer Nature and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
Database: Engineering Source
Description
Abstract:The (La0.2Sm0.2Gd0.2Y0.2Yb0.2)3Nb0.5Ta0.5O7 was designed and synthesized adopting chemical method and high-temperature calcining technique. Its phase structure, micromorphology, element content and type, and thermophysical and mechanical performances were studied. The final conclusions indicate that the achieved high-entropy compound has a sole pyrochlore lattice, dense microstructure and mean distribution of element. Because of the aggravated phonon scattering caused by the substitutional cations, oxygen vacancies and lattice distortion, its room and high-temperature thermal conductivities were less than that of Y2O3 stabilized zirconia (YSZ). The high-entropy compound also exhibits a great thermal expansion coefficient and phase steadiness until 1200 °C, its elastic modulus was higher than that of YSZ, while its fracture toughness and microhardness were smaller than corresponding values of YSZ. [ABSTRACT FROM AUTHOR]
ISSN:10599495
DOI:10.1007/s11665-025-13136-8