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Research Article | Open Access

Facile synthesis of high-entropy zirconate nanopowders and their sintering behaviors

Lin Tana, Xinghua Sua,b( ), Jingxin Yanga, Pengchao Jia, Fu Suna, Qiang Tianb, Zhenhuan Zhaoc
School of Materials Science and Engineering, Chang’an University, Xi’an 710061, China
State Key Laboratory of Environment-Friendly Energy Materials, Southwest University of Science and Technology, Mianyang 621010, China
School of Advanced Materials and Nanotechnology, Xidian University, Xi’an 710126, China
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Graphical Abstract

Abstract

The challenge in synthesizing high-entropy ceramic (HEC) nanopowders is to suppress severe grain coarsening and particle agglomeration, which occur at elevated temperatures. This challenge could be addressed by the polyacrylamide gel method. In this work, single-phase high-entropy (La0.2Nd0.2Sm0.2Gd0.2Yb0.2)2Zr2O7 and (La0.2Nd0.2Y0.2Eu0.2Gd0.2)2Zr2O7 nanopowders without agglomeration were successfully synthesized using the polyacrylamide gel method for the first time. The results showed that phase composition, particle size, and agglomeration degree of the nanopowders were greatly influenced by the molar ratio of acrylamide (AM)/Zr and calcination temperature. These as-synthesized high-entropy zirconate (HEZ) nanopowders could be sintered into fully dense ceramics at 1500 ℃ for 2 h. These HEZ nanopowders showed a phase transformation from a defect-fluorite phase to a pyrochlore phase with the increase of sintering temperature. Additionally, two-step sintering of these nanopowders was conducted, and the HEZ ceramics with fine grains were prepared. The polyacrylamide gel method is simple and easily operated, which is a facile approach of producing the HEC nanopowders with excellent sinterability.

Keywords

high-entropy ceramics (HECs)nanopowderszirconateacrylamide (AM)sintering

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Journal of Advanced Ceramics
Volume 12 Issue 3,
March 2023
Pages 498-509
DOI: 10.26599/JAC.2023.9220699
Cite this article:
Tan L, Su X, Yang J, et al. Facile synthesis of high-entropy zirconate nanopowders and their sintering behaviors. Journal of Advanced Ceramics, 2023, 12(3): 498-509. https://doi.org/10.26599/JAC.2023.9220699

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Received: 13 August 2022
Accepted: 27 November 2022
Published: 16 February 2023
© The Author(s) 2022.

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