Synthesis and characterization of dysprosium oxide doped magnesium borotellurite glass system

Kamaludin, Najah Wahida (2022) Synthesis and characterization of dysprosium oxide doped magnesium borotellurite glass system. [Project Paper] (Submitted)

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Abstract

Over the years, borotellurite glasses have greatly impacted the advanced scientific materials research attracting many researchers to study and investigate on the fabrication of borotellurite glass. Nevertheless, the research on physical, structural, optical and elastic aspects of borotellurite glass doped with Dysprosium (III) oxide are still restricted. In this thesis, a glass series with empirical formula (60-x) TeO2-30B2O3-10MgO-xDy2O3 where x = 0, 1.0, 1.5 and 2.0 mol % were derived from melt-quenching method and the physical, structural, optical and elastic properties of the glasses were examined. By Archimedes principle, the physical properties of the glasses can be determined when the addition of Dy2O3 has increased the density from 4.105 g/cm3 to 4.410 g/cm3 and the molar volume decreased from 29.397 cm3 /mol to 28.332 cm3 mol. The structural properties of the prepared glass are examined by X-ray diffraction (XRD). It can be assured that the glasses are in amorphous state as there is no continuous sharp peak present but only a broad hump exists at a lower angle 20°-35°. From the result shown in UV-Vis spectroscopy, the absorption spectra will increase and the intensive absorption can be seen in the wavelength 913nm, 1098nm and 1286 nm with the increase in concentration of dopants correspond to the transition of 6F9/2, 6F11/2 and 6H11/2 from the ground state level, 6H15/2. The optical absorption spectra were analyzed to determine optical band gap energy. The direct band gap energy values were obtained in between 2.27 eV – 2.92 eV while the indirect band gap energy were measured in between 1.38 eV – 2.53 eV . At the range of 485nm and 576nm wavelengths, photoluminescence spectroscopy reveals two distinct emission bands: a blue and yellow emission, respectively. Glass network stiffness increased from 3841.345 cm/s to 3958.512 cm/s and 2228.977 cm/s to 2305.487 cm/s as the Dy2O3 content increased from 0.0 mol percent to 2.0 mol percent according to the elastic characteristics estimated from recorded ultrasonic velocities. Other than that, the Poisson's ratio and micro hardness increased from 5.359 to 6.200 as dysprosium ions were added to the mixture. Dy3+ doped borotellurite glass can be utilized in lasers, sensors, and fiber amplifiers, among other things.

Item Type:	Project Paper
Faculty:	Fakulti Sains
Depositing User:	Ms. ROHANA ALIAS
Date Deposited:	21 May 2024 00:04
Last Modified:	05 Aug 2024 08:58
URI:	http://psaspb.upm.edu.my/id/eprint/1887

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