Heavily doped high-entropy A2B2O7 pyrochlore

Matović Branko; Maletaškić Jelena; Maksimović Vesna; Zagorac Jelena; Luković Aleksa; Zeng Yu-Ping; Cvijović-Alagić Ivana

doi:10.2298/PAC2302113M

Processing and Application of Ceramics (Jun 2023)

Heavily doped high-entropy A2B2O7 pyrochlore

Matović Branko,
Maletaškić Jelena,
Maksimović Vesna,
Zagorac Jelena,
Luković Aleksa,
Zeng Yu-Ping,
Cvijović-Alagić Ivana

Affiliations

Matović Branko: ORCiD; Center of Excellence “CEXTREME LAB”, Vinča Institute of Nuclear Sciences - National Institute of the Republic of Serbia, University of Belgrade, Belgrade, Serbia + State Key Laboratory of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai, China
Maletaškić Jelena: ORCiD; Center of Excellence “CEXTREME LAB”, Vinča Institute of Nuclear Sciences - National Institute of the Republic of Serbia, University of Belgrade, Belgrade, Serbia
Maksimović Vesna: ORCiD; Center of Excellence “CEXTREME LAB”, Vinča Institute of Nuclear Sciences - National Institute of the Republic of Serbia, University of Belgrade, Belgrade, Serbia
Zagorac Jelena: ORCiD; Center of Excellence “CEXTREME LAB”, Vinča Institute of Nuclear Sciences - National Institute of the Republic of Serbia, University of Belgrade, Belgrade, Serbia
Luković Aleksa: ORCiD; Center of Excellence “CEXTREME LAB”, Vinča Institute of Nuclear Sciences - National Institute of the Republic of Serbia, University of Belgrade, Belgrade, Serbia
Zeng Yu-Ping: State Key Laboratory of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai, China
Cvijović-Alagić Ivana: ORCiD; Center of Excellence “CEXTREME LAB”, Vinča Institute of Nuclear Sciences - National Institute of the Republic of Serbia, University of Belgrade, Belgrade, Serbia

DOI: https://doi.org/10.2298/PAC2302113M
Journal volume & issue: Vol. 17, no. 2
pp. 113 – 117

Abstract

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A novel class of high-entropy pyrochlore compounds with multiple elements at the A and B site positions (A2B2O7) was successfully obtained. Powders with (La1/7Sm1/7Nd1/7Pr1/7Y1/7Gd1/7Yb1/7)2(Sn1/3Hf1/3Zr1/3)2O7 nominal composition were fabricated from pure metal oxides obtained through a reaction of metal nitrates (for site A) and metal chlorides (for site B) with sodium hydroxide during the solid-state displacement reaction (SSDR). The phase evolution was analyzed using XRD method. During the thermal treatment of ten individual metal oxides, the single pyrochlore phase was created. The present study showed that the highdensity (98%TD) ceramics with a hardness of 8.1GPa was successfully obtained after pressureless sintering at 1650 °C for 4 h. Results of the Raman study and the Rietveld structural refinement showed that sintered highentropy ceramics is characterized by a single-phase pyrochlore structure, which was investigated in detail.

Published in Processing and Application of Ceramics

ISSN: 1820-6131 (Print); 2406-1034 (Online)
Publisher: University of Novi Sad
Country of publisher: Serbia
LCC subjects: Technology: Chemical technology: Clay industries. Ceramics. Glass
Website: http://www.tf.uns.ac.rs/publikacije/PAC/index.html

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