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Journal of Advanced Ceramics 2023, 12(3): 498-509 https://doi.org/10.26599/JAC.2023.9220699
Research Article | Open Access | Issue | Published: 16 February 2023

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

Show Author's Information 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
Keywords:
sintering, high-entropy ceramics (HECs), nanopowders, zirconate, acrylamide (AM)
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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Abstract Full text Electronic supplementary material About this article

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.


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About this article

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

Show Author's information 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

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: sintering, high-entropy ceramics (HECs), nanopowders, zirconate, acrylamide (AM)

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Publication history

Received: 13 August 2022
Accepted: 27 November 2022
Published: 16 February 2023
Issue date: March 2023

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© The Author(s) 2022.

Acknowledgements

This work was financially supported by the Key Research and Development Projects of Shaanxi Province (Grant No. 2021GY-250), the Open Project of State Key Laboratory of Environment-Friendly Energy Materials (Grant No. 20kfhg06), and the Fundamental Research Funds for the Central Universities of China (Grant No. 300102312406).

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