Synthesis and characterization of high-entropy A2B2O7 pyrochlore with multiple elements at A and B sites

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

doi:10.2298/SOS220802023M

Science of Sintering (Jan 2024)

Synthesis and characterization of high-entropy A2B2O7 pyrochlore with multiple elements at A and B sites

Matović Branko,
Maletaškić Jelena,
Maksimović Vesna,
Dimitrijević Silvana,
Todorović Bratislav,
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
Dimitrijević Silvana: ORCiD; Mining and Metallurgy Institute Bor, Bor, Serbia
Todorović Bratislav: ORCiD; Faculty of Technology Leskovac, University of Niš, Leskovac, 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/SOS220802023M
Journal volume & issue: Vol. 56, no. 1
pp. 123 – 130

Abstract

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Single nano high-entropy pyrochlore-type compound (A2B2O7) with 7 different rareearth cations at site A and 3 different metal cations at site B with equiatomic amounts (7A1/7)2(3B1/3)2O7 is successfully obtained. The powder with nominal composition (La1/7Sm1/7Nd1/7Pr1/7Y1/7Gd1/7Yb1/7)2(Sn1/3Hf1/3Zr1/3)2O7 was fabricated by reacting metal nitrates (site A) and metal chlorides (site B) with glycine during the combustion reaction. The XRD analysis revealed that the powder attained during synthesis is in an amorphous state. To induce crystallization of the obtained pyrochlore structure, the post-calcination process at 600-1500°C was conducted and studied. Results of this study showed that the monophase pyrochlore (A2B2O7) structure is obtained during the calcination at 900°C. The high-density ceramic pellet with 97% of theoretical density and free of any additives was obtained through pressureless sintering at 1650°C for 4 h in the air using the powder calcined at 900°C.

Published in Science of Sintering

ISSN: 0350-820X (Print); 1820-7413 (Online)
Publisher: International Institute for the Science of Sintering, Beograd
Country of publisher: Serbia
LCC subjects: Technology: Chemical technology
Website: http://www.doiserbia.nb.rs/journal.aspx?issn=0350-820X

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