Formation and mechanical properties of Y-substituted (Ce0.2Zr0.2La0.2Sm0.2Nd0.2)O2-δ high-entropy fluorite oxide

Bo Ma; Zhiqin Wen; Jiedong Qin; Taoyi Lu; Li Tang; Zhenyu Wu; Yuhong Zhao

Journal of Materials Research and Technology (Nov 2024)

Formation and mechanical properties of Y-substituted (Ce0.2Zr0.2La0.2Sm0.2Nd0.2)O2-δ high-entropy fluorite oxide

Bo Ma,
Zhiqin Wen,
Jiedong Qin,
Taoyi Lu,
Li Tang,
Zhenyu Wu,
Yuhong Zhao

Affiliations

Bo Ma: Key Laboratory of New Processing Technology for Nonferrous Metals & Materials, Ministry of Education, Collaborative Innovation Center for Exploration of Nonferrous Metal Deposits and Efficient Utilization of Resources, School of Materials Science and Engineering, Guilin University of Technology, Guilin, 541004, China
Zhiqin Wen: Key Laboratory of New Processing Technology for Nonferrous Metals & Materials, Ministry of Education, Collaborative Innovation Center for Exploration of Nonferrous Metal Deposits and Efficient Utilization of Resources, School of Materials Science and Engineering, Guilin University of Technology, Guilin, 541004, China; Corresponding author.
Jiedong Qin: Key Laboratory of New Processing Technology for Nonferrous Metals & Materials, Ministry of Education, Collaborative Innovation Center for Exploration of Nonferrous Metal Deposits and Efficient Utilization of Resources, School of Materials Science and Engineering, Guilin University of Technology, Guilin, 541004, China
Taoyi Lu: Key Laboratory of New Processing Technology for Nonferrous Metals & Materials, Ministry of Education, Collaborative Innovation Center for Exploration of Nonferrous Metal Deposits and Efficient Utilization of Resources, School of Materials Science and Engineering, Guilin University of Technology, Guilin, 541004, China
Li Tang: Key Laboratory of New Processing Technology for Nonferrous Metals & Materials, Ministry of Education, Collaborative Innovation Center for Exploration of Nonferrous Metal Deposits and Efficient Utilization of Resources, School of Materials Science and Engineering, Guilin University of Technology, Guilin, 541004, China
Zhenyu Wu: Key Laboratory of New Processing Technology for Nonferrous Metals & Materials, Ministry of Education, Collaborative Innovation Center for Exploration of Nonferrous Metal Deposits and Efficient Utilization of Resources, School of Materials Science and Engineering, Guilin University of Technology, Guilin, 541004, China
Yuhong Zhao: School of Materials Science and Engineering, North University of China, Taiyuan, 030051, China

Journal volume & issue: Vol. 33
pp. 7325 – 7332

Abstract

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In this paper, in order to improve the mechanical properties of high-entropy fluorite oxides (HEFOs), five equimolar multicomponent oxides were synthesized by solid-phase reaction method by using element Y replacing one of the five cations in (Ce0.2Zr0.2La0.2Sm0.2Nd0.2)O2-δ. The substitution of La, Sm or Nd in (Ce0.2Zr0.2La0.2Sm0.2Nd0.2)O2-δ with Y element are able to form single-phase HEFOs at 1600 °C, while Ce4+ and Zr4+ replaced by Y3+ contains a large number of secondary phase. The former three components are almost dense and smooth, and all the elements are uniformly distributed with no obvious segregation and agglomeration. The Ce3+ concentration of Y-substituted Sm HEFOs is calculated to be 13.7%, yielding a nominal composition of (Ce0.2Zr0.2Y0.2Sm0.2Nd0.2)O1.6863. In addition, the HEFOs have the best mechanical properties with Vickers hardnesses, flexural strengths and fracture toughnesses of 15.12 GPa, 101.1 MPa and 7.88 MPa-mm1/2, respectively, which have potential applications in high-performance structural materials.

Published in Journal of Materials Research and Technology

ISSN: 2238-7854 (Print); 2214-0697 (Online)
Publisher: Elsevier
Country of publisher: Netherlands
LCC subjects: Technology: Mining engineering. Metallurgy
Website: https://www.journals.elsevier.com/journal-of-materials-research-and-technology/

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