Influence of order-disorder transition on the mechanical and thermophysical properties of A2B2O7 high-entropy ceramics

Jiatong ZHU; Mingyue WEI; Jie XU; Runwu YANG; Xuanyu MENG; Ping ZHANG; Jinlong YANG; Guangzhong LI; Feng GAO

doi:10.1007/s40145-022-0605-3

Journal of Advanced Ceramics 2022, 11(8): 1222-1234 https://doi.org/10.1007/s40145-022-0605-3

Research Article |

Open Access | Issue | Published: 25 July 2022

Influence of order-disorder transition on the mechanical and thermophysical properties of A₂B₂O₇ high-entropy ceramics

Show Author's Information Hide Author's Information Jiatong ZHU^{^a}, Mingyue WEI^{^a}, Jie XU^{^a^,^b}(

), Runwu YANG^{^a}, Xuanyu MENG^{^a}, Ping ZHANG^{^a}, Jinlong YANG^{^c}, Guangzhong LI^{^d}(

), Feng GAO^{^a^,^b}

aState Key Laboratory of Solidification Processing, MIIT Key Laboratory of Radiation Detection Materials and Devices, School of Materials Science and Engineering, Northwestern Polytechnical University, Xi’an 710072, China

bNPU-QMUL Joint Research Institute of Advanced Materials and Structure, Northwestern Polytechnical University, Xi’an 710072, China

cState Key Laboratory of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua University, Beijing 100084, China

dState Key Laboratory of Porous Metal Materials, Northwest Institute for Nonferrous Metal Research, Xi’an 710016, China

Keywords:

thermal conductivity, high-entropy ceramics, mechanical properties, A₂B₂O₇, order-disorder transition (ODT)

Cite this article:

ZHU J, WEI M, XU J, et al. Influence of order-disorder transition on the mechanical and thermophysical properties of A₂B₂O₇ high-entropy ceramics. Journal of Advanced Ceramics, 2022, 11(8): 1222-1234. https://doi.org/10.1007/s40145-022-0605-3

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Abstract

The order-disorder transition (ODT) of A₂B₂O₇ compounds obtained enormous attention owing to the potential application for thermal barrier coating (TBC) design. In this work, the influence of ODT on the mechanical and thermophysical properties of dual-phase A₂B₂O₇ high-entropy ceramics was investigated by substituting Ce⁴⁺ and Hf⁴⁺ with different ionic radii on B-sites (Zr⁴⁺). The X-ray diffraction (XRD), Raman, and transmission electron microscopy (TEM) results show that r_A3+/r_B4+ = 1.47 is the critical value of ODT phase boundary with different doping B-site ion contents, and the energy dispersive spectroscopy (EDS) results further indicate the uniform distribution of elements. Interestingly, owing to the high intrinsic disorder derived from high-entropy effect, the A₂B₂O₇ high-entropy ceramics exhibit unreduced modulus (E₀ ≈ 230 GPa) and enhanced mechanical properties (HV ≈ 10 GPa, K_IC ≈ 2.3 MPa·m^0.5). A₂B₂O₇ high-entropy ceramics exhibit excellent thermal stability with relatively high thermal expansion coefficients (TECs) (Hf0.25, 11.20×10^-6 K^-1, 1000 ℃). Moreover, the matching calculation implied that the ODT further enhances the phonon scattering coefficient, leading to a relatively lower thermal conductivity of (La_0.25Eu_0.25Gd_0.25Yb_0.25)₂(Zr_0.85Ce_0.15)₂O₇ (1.48-1.51 W/(m·K), 100-500 ℃) compared with other components. This present work provides a novel composition design principle for high-entropy ceramics, as well as a material selection rule for high-temperature insulation applications.

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About this article

Influence of order-disorder transition on the mechanical and thermophysical properties of A₂B₂O₇ high-entropy ceramics

Show Author's information Hide Author's Information Jiatong ZHU^{^a}, Mingyue WEI^{^a}, Jie XU^{^a^,^b}(

), Runwu YANG^{^a}, Xuanyu MENG^{^a}, Ping ZHANG^{^a}, Jinlong YANG^{^c}, Guangzhong LI^{^d}(

), Feng GAO^{^a^,^b}

bNPU-QMUL Joint Research Institute of Advanced Materials and Structure, Northwestern Polytechnical University, Xi’an 710072, China

cState Key Laboratory of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua University, Beijing 100084, China

dState Key Laboratory of Porous Metal Materials, Northwest Institute for Nonferrous Metal Research, Xi’an 710016, China

Abstract

Keywords: thermal conductivity, high-entropy ceramics, mechanical properties, A₂B₂O₇, order-disorder transition (ODT)

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Publication history

Received: 20 December 2021

Revised: 13 April 2022

Accepted: 27 April 2022

Published: 25 July 2022

Issue date: August 2022

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Acknowledgements

This work was supported by the National Natural Science Foundation of China (No. 52072301), State Key Laboratory of New Ceramics and Fine Processing Tsinghua University (No. KFZD202102), State Key Laboratory of Solidification Processing (NPU) (No. 2021-TS-08), the China-Poland International Collaboration Fund of the National Natural Science Foundation of China (No. 51961135301), the Fundamental Research Funds for the Central Universities (No. D5000210722), and State Key Laboratory of Materials Processing and Die & Mould Technology, Huazhong University of Science and Technology (No. P2020-009). We would like to acknowledge the Analytical & Testing Center of Northwestern Polytechnical University for the XRD, SEM, and other analyses.

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