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Powder Metallurgy аnd Functional Coatings (Izvestiya Vuzov. Poroshkovaya Metallurgiya i Funktsional'nye Pokrytiya)

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Synthesis of high-entropy (Y0.2Yb0.2Lu0.2Eu0.2Er0.2)3Al5O12 ceramics using a fast electron beam

https://doi.org/10.17073/1997-308X-2026-2-40-47

Abstract

High-entropy ceramics intended for thermal barrier coatings are developed to improve their performance properties, particularly by increasing their operating temperature. However, conventional synthesis of high-entropy ceramics is time-consuming. This study explores a nonconventional approach to reducing synthesis time by processing ceramic materials with a high-power beam of high-energy electrons (fast electrons). A powder mixture of the initial reactants Y2O3 , Yb2O3 , Lu2O3 , Eu2O3 , Er2O3 , and Al2O3 was heated in air using 1.4 MeV electrons at different electron-beam currents. The cuvette containing the powder mixture was moved beneath the beam at 1 cm/s, while the beam was scanned across the width of the  internal volume of the cuvette. The total irradiation time was 10 s. At beam currents of 4 mA or higher, melt droplets formed within the irradiated powder mass, and their proportion relative to the unmelted powder increased with increasing current. Crystallization occured in the melt droplets during cooling. The resulted droplet-shaped ceramic product was highly porous because of the intense release of adsorbed gases from the melt. SEM images and EDS elemental maps relealed a uniform distribution of the constituent elements throughout the droplet-shaped ceramic product. XRD analysis identified the synthesized material as high-entropy (Y0.2Yb0.2Lu0.2Eu0.2Er0.2 )3Al5O12 ceramic. The powder that did not contribute to the formation of the droplet-shaped product was an intermediate product containing Er3Al5O12 and Y3Al5O12 garnets, together with Er2O3 , Yb2O3 , Y2O3 , Eu2O3 , Lu2O3 , Al2O3 oxides.

About the Authors

S. A. Ghyngazov
National Reserch Tomsk Polytechnic University
Russian Federation

Sergey A. Gyngazov – Dr. Sci. (Eng.), Professor, Leading Research Scientist,  Research Laboratory for Electronics, Semiconductors and Dielectrics, Research School of High-Energy Physics

30 Lenin Prosp., Tomsk 634050, Russia


I. P. Vasil’ev
National Reserch Tomsk Polytechnic University
Russian Federation

Ivan P. Vasil’ev – Cand. Sci. (Eng.), Research Scientist, Research Laboratory for Electronics, Semiconductors and Dielectrics, Research School of High-Energy Physics

30 Lenin Prosp., Tomsk 634050, Russia


V. A. Boltueva
National Reserch Tomsk Polytechnic University
Russian Federation

Valeria A. Boltueva – Cand. Sci. (Eng.), Junior Research Scientist, Research Laboratory of Electronics, Semiconductors and Dielectrics, Research School of High-Energy Physics

30 Lenin Prosp., Tomsk 634050, Russia


V. P. Krivobokov
National Reserch Tomsk Polytechnic University
Russian Federation

Valery P. Krivobokov – Dr. Sci. (Phys.- Math.), Professor, Head of the Weinberg Research Center, TPU; Head of the Laboratory of Radiation and Plasma Technologies

30 Lenin Prosp., Tomsk 634050, Russia


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Review

For citations:

Ghyngazov S.A., Vasil’ev I.P., Boltueva V.A., Krivobokov V.P. Synthesis of high-entropy (Y0.2Yb0.2Lu0.2Eu0.2Er0.2)3Al5O12 ceramics using a fast electron beam. Powder Metallurgy аnd Functional Coatings (Izvestiya Vuzov. Poroshkovaya Metallurgiya i Funktsional'nye Pokrytiya). 2026;20(2):40-47. (In Russ.) https://doi.org/10.17073/1997-308X-2026-2-40-47

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ISSN 1997-308X (Print)
ISSN 2412-8767 (Online)

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