Articles
  • Reactive ultrafast high-temperature sintering of (La0.2Gd0.2Sm0.2Eu0.2M0.2)2Zr2O7 (M=Y or Yb) high-entropy ceramics

  • Jiahang Liua, Zhe Lua,*, Yeon-Gil Jungb,*, Yan Lia, Yanwen Zhoua, Hao Chenc, Jeong-Hun Sonb, Heekyu Choib and Jun-Seob Leeb

  • aSchool of Materials and Metallurgical Engineering, University of Science and Technology Liaoning, Anshan 114051, China
    bSchool of Materials Science and Engineering, Changwon National University, Changwon, Gyeongnam 641773, Republic of Korea
    cShandong Nuclear Power Equipment Manufacturing Co., Ltd, Haiyang 265100, China

  • This article is an open access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/4.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

In the present work, a single-phase (La0.2Gd0.2Sm0.2Eu0.2Y0.2)2Zr2O7 (LGSEY) high-entropy ceramic with pyrochlore structure and a dual-phase (La0.2Gd0.2Sm0.2Eu0.2Yb0.2)2Zr2O7 (LGSEYb) high-entropy ceramic with co-existing pyrochlore and fluorite structure were designed by cation radius differences and successfully synthesized by reactive ultrafast high-temperature sintering (RUHS). The synthesis was completed in less than 1 h, demonstrating the efficiency of the RUHS technique for preparing complex high-entropy Re2Zr2O7 ceramics. XRD results showed that RUHS could synthesize high-entropy Re2Zr2O7 with a specified phase composition. TEM and SEM confirmed the uniform distribution of rare-earth elements in the ceramics, minimizing compositional bias and enhancing material properties. Both ceramics exhibited low thermal conductivity due to significant lattice distortion, with LGSEYb displaying an amorphous thermal conductivity. In addition, the inherent cationic radius differences and lattice distortions in high-entropy ceramics contribute to the low Young’s modulus and high hardness. Finally, both ceramics exhibit excellent high-temperature phase stability from room temperature to 1500 ℃. This work highlights the potential of RUHS for synthesizing high-entropy ceramics with complex structures and provides valuable insights for optimizing their use in thermal barrier coatings.


Keywords: Ultrafast high-temperature sintering, High-entropy ceramic, Structure, Thermal conductivity, Mechanical properties.

This Article

  • 2025; 26(3): 386-396

    Published on Jun 30, 2025

  • 10.36410/jcpr.2025.26.3.386
  • Received on Dec 18, 2024
  • Revised on Feb 17, 2025
  • Accepted on Feb 28, 2025

Correspondence to

  • Zhe Lu a, Yeon-Gil Jung b

  • aSchool of Materials and Metallurgical Engineering, University of Science and Technology Liaoning, Anshan 114051, China
    bSchool of Materials Science and Engineering, Changwon National University, Changwon, Gyeongnam 641773, Republic of Korea
    Zhe Lu Tel: +86-15941242356
    Yeon-Gil Jung Tel: 055-213-3712

  • E-mail: lz19870522@126.com, jungyg@changwon.ac.kr