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Journal of Sol-Gel Science and Technology

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07-06-2023 | Original Paper: Nano- and macroporous materials (aerogels, xerogels, cryogels, etc.)

Epoxide synthesis of binary rare earth oxide aerogels with high molar ratios (1:1) of Eu, Gd, and Yb

Authors: S. V. Kameneva, Kh. E. Yorov, R. K. Kamilov, S.Yu. Kottsov, M. A. Teplonogova, T. V. Khamova, M. A. Popkov, I. V. Tronev, A. E. Baranchikov, V. K. Ivanov

Published in: Journal of Sol-Gel Science and Technology | Issue 3/2023

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Abstract

Aerogels containing rare earth elements are promising compounds for designing various functional materials, since they combine the properties of aerogels - high surface area and porosity, and the luminescent and catalytic properties of rare earth elements. A modified sol-gel method was developed to produce mixed rare earth oxide aerogels (Eu₂O₃/Gd₂O₃, Eu₂O₃/Yb₂O₃, and Gd₂O₃/Yb₂O₃) with high metal to metal molar ratio (1:1) and individual (Eu₂O₃, Gd₂O₃, and Yb₂O₃) aerogels. Rare earth nitrates, propylene oxide, and citric acid were used for the synthesis of monolithic halogen-free rare earth oxide aerogels. The aerogels obtained by supercritical drying in CO₂ possess mesoporous structure and high surface area (180–350 m²/g). Uniform distribution of elements in binary oxides was confirmed by EDX. Calcination at 600–800 °С causes crystallization of the amorphous aerogels. XRD patterns of the binary oxides after calcination corresponded to single phase cubic (\(Ia\overline 3\)) structure of rare earth M₂O₃ oxide, which indicated the formation of solid solutions. The Eu₂O₃/Gd₂O₃ and Eu₂O₃ aerogels demonstrate strong luminescence in visible region at near UV excitation, which was also observed after calcination of the aerogels at 800 °C.

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Title: Epoxide synthesis of binary rare earth oxide aerogels with high molar ratios (1:1) of Eu, Gd, and Yb
Authors: S. V. Kameneva
Kh. E. Yorov
R. K. Kamilov
S.Yu. Kottsov
M. A. Teplonogova
T. V. Khamova
M. A. Popkov
I. V. Tronev
A. E. Baranchikov
V. K. Ivanov
Publication date: 07-06-2023
Publisher: Springer US
Published in: Journal of Sol-Gel Science and Technology / Issue 3/2023
Print ISSN: 0928-0707
Electronic ISSN: 1573-4846
DOI: https://doi.org/10.1007/s10971-023-06149-z

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