Sol-Gel Synthesis and Characterization of Cerium-Doped Yttrium Silicate

Albena Yoleva, Stoyan Djambazov, Georgi Chernev

Abstract

A (Y0.995Ce0.005)2SiO5 ceramic phosphor was prepared using the sol-gel method. The starting raw materials were yttrium nitrate hexahydrate, cerium nitrate hexahydrate, and tetraethyl orthosilicate. The obtained sol was dried at 70oC to form a gel that was thermally treated at different temperatures up to 1400°C with a hold of 2 h at the maximum temperature. The synthesized powders were characterized using XRD, SEM, EDS, and luminescence analyses. At up to 800°C, the synthesized product is amorphous. At 1000°C, the predominant phase is Y2SiO5-X1, and there is a small amount of phase Y4.67(SiO4)3O. At 1200oC, the phases Y2SiO5–X2 (PDF #36-1476), Y4.67(SiO4)3O, and some Y2O3 are evident. At 1400°C, Y2SiO5–X2 becomes the main phase together with a small amount of the Y2Si2O7 phase. SEM and EDS confirm the XRD results for the synthesized Y2SiO5-X2 phase at 1400oC. The SEM image reveals particles ranging in size from 1 to 5 microns, displaying irregular to spherical shapes. These particles are observed to be interconnected in agglomerates. EDS indicates that it contains 25.51-wt.% SiO2, 72.32-wt.% Y2O3, and 2.17-wt.% CeO. At 1400°C, the resulting ceramic phosphor Y2SiO5:Ce3+ exhibits photoluminescence emission peaks at 263, 301, and 356 nm at λ excitation of a 433-nm wavelength. The aim of the present study is the low-temperature synthesis of cerium-doped ceramic phosphor with potential application as an additive in glasses for dental glazes for application on zirconium dental implants to increase the fluorescent and luminescent properties of the same.

 

Keywords: sol-gel synthesis, cerium-doped yttrium silicate, Y2SiO5-X2 phase, ceramic phosphor.

 

https://doi.org/10.55463/issn.1674-2974.51.5.6


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