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Journal of Advanced Ceramics 2023, 12(2): 399-413 https://doi.org/10.26599/JAC.2023.9220693
Research Article | Open Access | Issue | Published: 03 January 2023

Mechanical property enhancements and amorphous thermal transports of ordered weberite-type RE3Nb/TaO7 high-entropy oxides

Show Author's Information Lin Chena,  Keren Luoa,  Baihui Lia,  Mingyu Hub( ),  Jing Fenga( )
Faculty of Materials Science and Engineering, Kunming University of Science and Technology, Kunming 650093, China
Peking University Shenzhen Graduate School, Shenzhen 518055, China
Keywords:
high-entropy oxides (HEOs), fracture toughness (KIC), RE niobates/tantalates (RE3Nb/TaO7), stiffness (K), thermal transports
Cite this article:
Chen L, Luo K, Li B, et al. Mechanical property enhancements and amorphous thermal transports of ordered weberite-type RE3Nb/TaO7 high-entropy oxides. Journal of Advanced Ceramics, 2023, 12(2): 399-413. https://doi.org/10.26599/JAC.2023.9220693
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Abstract Full text About this article

A3BO7-type (A = rare earth (RE), B = Nb or Ta) oxides have been studied as protective coating materials because of their low thermal conductivity; however, their hardness, toughness, and stiffness are insufficient, particularly for members with webeirte-type structures. In this work, we have synthesized two high-entropy oxides (HEOs) of weberite-type RE niobates/tantalates (RE3Nb/TaO7), i.e., (Nd1/7Sm1/7Eu1/7Gd1/7Dy1/7Ho1/7Er1/7)3NbO7 (7HEOs-Nb) and (Nd1/7Sm1/7Eu1/7Gd1/7Dy1/7Ho1/7Er1/7)3(Nb1/2Ta1/2)O7 (7HEOs-NbTa), to overcome the mechanical deficiencies. The short- and long-range ordered arrangements of RE cations in the A-site and Nb/Ta cations in the B-site were identified by the X-ray diffraction (XRD), scanning electron microscopy equipped with energy-dispersive spectrometry (EDS), and transmission electron microscopy. The enhancements in hardness (H = 9.4 GPa) and fracture toughness (KIC = 2.0 MPa·m1/2) were realized by grain refinement, solid solution strengthening, and high stiffness (K). The exceptional phase stability at 25−1500 ℃, amorphous thermal conductivity (k = 1.5−1.7 W·m−1·K−1 at 25−900 ℃), and high thermal expansion coefficients (TEC > 11.0×10−6 K−1 at 1500 ℃) further supported their potential application as protective coating materials.


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Mechanical property enhancements and amorphous thermal transports of ordered weberite-type RE3Nb/TaO7 high-entropy oxides

Show Author's information Lin Chena, Keren Luoa, Baihui Lia, Mingyu Hub( ), Jing Fenga( )
Faculty of Materials Science and Engineering, Kunming University of Science and Technology, Kunming 650093, China
Peking University Shenzhen Graduate School, Shenzhen 518055, China

Abstract

A3BO7-type (A = rare earth (RE), B = Nb or Ta) oxides have been studied as protective coating materials because of their low thermal conductivity; however, their hardness, toughness, and stiffness are insufficient, particularly for members with webeirte-type structures. In this work, we have synthesized two high-entropy oxides (HEOs) of weberite-type RE niobates/tantalates (RE3Nb/TaO7), i.e., (Nd1/7Sm1/7Eu1/7Gd1/7Dy1/7Ho1/7Er1/7)3NbO7 (7HEOs-Nb) and (Nd1/7Sm1/7Eu1/7Gd1/7Dy1/7Ho1/7Er1/7)3(Nb1/2Ta1/2)O7 (7HEOs-NbTa), to overcome the mechanical deficiencies. The short- and long-range ordered arrangements of RE cations in the A-site and Nb/Ta cations in the B-site were identified by the X-ray diffraction (XRD), scanning electron microscopy equipped with energy-dispersive spectrometry (EDS), and transmission electron microscopy. The enhancements in hardness (H = 9.4 GPa) and fracture toughness (KIC = 2.0 MPa·m1/2) were realized by grain refinement, solid solution strengthening, and high stiffness (K). The exceptional phase stability at 25−1500 ℃, amorphous thermal conductivity (k = 1.5−1.7 W·m−1·K−1 at 25−900 ℃), and high thermal expansion coefficients (TEC > 11.0×10−6 K−1 at 1500 ℃) further supported their potential application as protective coating materials.

Keywords: high-entropy oxides (HEOs), fracture toughness (KIC), RE niobates/tantalates (RE3Nb/TaO7), stiffness (K), thermal transports

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Publication history

Received: 06 September 2022
Revised: 11 October 2022
Accepted: 07 November 2022
Published: 03 January 2023
Issue date: February 2023

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© The Author(s) 2022.

Acknowledgements

This work was funded by the National Natural Science Foundation of China (No. 91960103), Yunnan Province Science Fund for Distinguished Young Scholars (No. 2019FJ006), and the Rare and Precious Metals Material Genetic Engineering Project of Yunnan Province (No. 202102AB080019-1).

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