Authors
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Branko Matović
Center of Excellence “CEXTREME LAB”, Vinča Institute of Nuclear Sciences - National Institute of the Republic of Serbia, University of Belgrade; State Key Laboratory of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences
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Jelena Maletaškić
Center of Excellence “CEXTREME LAB”, Vinča Institute of Nuclear Sciences - National Institute of the Republic of Serbia, University of Belgrade
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Vesna Maksimović
Center of Excellence “CEXTREME LAB”, Vinča Institute of Nuclear Sciences - National Institute of the Republic of Serbia, University of Belgrade
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Silvana Dimitrijević
Mining and Metallurgy Institute Bor
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Bratislav Todorović
Faculty of Technology Leskovac, University of Niš
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Jelena Zagorac
Center of Excellence “CEXTREME LAB”, Vinča Institute of Nuclear Sciences - National Institute of the Republic of Serbia, University of Belgrade
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Aleksa Luković
Center of Excellence “CEXTREME LAB”, Vinča Institute of Nuclear Sciences - National Institute of the Republic of Serbia, University of Belgrade
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Yu-Ping Zeng
State Key Laboratory of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences
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Ivana Cvijović-Alagić
Center of Excellence “CEXTREME LAB”, Vinča Institute of Nuclear Sciences - National Institute of the Republic of Serbia, University of Belgrade
Abstract
Single nano high-entropy pyrochlore-type compound (A2B2O7) with 7 different rare-earth 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.
