Influence of europium (III) oxide on the optical and luminescence properties of magnesium boro-tellurite glass system

Mohamad Razak, Nor’ Afifah (2022) Influence of europium (III) oxide on the optical and luminescence properties of magnesium boro-tellurite glass system. [Project Paper] (Submitted)

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Abstract

Four series of glass samples with chemical composition of (60-x) TeO2 – 30B2O3 – 10MgO – xEu2O3 where x = 0.0, 1.0, 1.5, 2.0 molar fraction were fabricated using conventional melt quenching method. This project proposes to synthesized a series of the selected chemical compositions of magnesium borotellurite glasses doped with various concentrations of Eu2O3 in order to study their physical, structural, optical and elastic properties. The addition of Eu2O3 into the glass composition modifies the properties of the glass system and increases the glass-forming ability. The physical properties of the well-prepared glass samples are characterized by using density and molar volume measurements. The density values of magnesium borotellurite glass doped Eu2O3 were found to increase with the addition of dopants. The decrement of the molar volume for all samples follows the relationship between the density and molar volume which are supposed to be inversely proportional to each other. The structural properties of the glass samples are examined by X-ray diffraction (XRD). The result shows that the amorphous nature of the glass samples was confirmed when using XRD analysis. Moreover, UV-Vis and Photoluminescence spectroscopy was used to evaluate the optical properties of glass samples. The results for indirect and direct optical band gap as well as Urbach energy possess the same trends as more dopants are added into the magnesium borotellurite glass system. The various values suggest that the formation of bridging and non- bridging oxygen take place in the glass network. For emission spectra of the glass samples which were obtained from Photoluminescence spectrometer, five transition bands were found 5D0→7F0 (556.5 nm), 5D0→7F1 (591 nm), 5D0→7F2 (616 nm), 5D0→7F3 (653 nm) and 5D0→7F4 (701.5 nm). Lastly, the elastic moduli and other elastic parameters of the prepared glass samples are found to increase with the addition of more europium in the magnesium borotellurite glass system. The increasing trends in the ultrasonic velocities are due to the increment in the rigidity of glasses. The value of Poisson’s ratio indicated that the Poisson’s ratio of all europium concentrations is within the range of 0.1-0.2. In this case, it can be concluded that the glasses have high cross-link density. The rise in microhardness value from 5.36 to 7.34 GPa can be explained by the increasing compactness of the glass system.

Item Type:	Project Paper
Faculty:	Fakulti Sains
Depositing User:	Ms. ROHANA ALIAS
Date Deposited:	05 Jun 2024 04:07
Last Modified:	05 Aug 2024 09:01
URI:	http://psaspb.upm.edu.my/id/eprint/1891

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