Characterization of lithium-magnesium-tellurite doped with erbium and neodymium glass

Tellurite glass based on (78-x)TeO2-10Li2O-10MgO-2Nd2O3-xEr2O3, (where x = 0.4 to 2.0 mol %) has successfully been prepared by melt-quenching technique. The colour of glass is found to vary from light violet to dark violet as the Er2O3 content is increased. No definite peaks are found from the X-ray...

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Main Author:	Roslan, Syaridatul Akmar
Format:	Thesis
Language:	English
Published:	2013
Subjects:	TA Engineering (General) Civil engineering (General)
Online Access:	http://eprints.utm.my/id/eprint/48174/1/SyaridatulAkmarMFS2013.pdf
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spelling	my-utm-ep.481742017-06-20T02:55:38Z Characterization of lithium-magnesium-tellurite doped with erbium and neodymium glass 2013 Roslan, Syaridatul Akmar TA Engineering (General). Civil engineering (General) Tellurite glass based on (78-x)TeO2-10Li2O-10MgO-2Nd2O3-xEr2O3, (where x = 0.4 to 2.0 mol %) has successfully been prepared by melt-quenching technique. The colour of glass is found to vary from light violet to dark violet as the Er2O3 content is increased. No definite peaks are found from the X-ray diffraction pattern, which shows that the glass is amorphous in nature. It also found that the densities and the molar volume of the glass increase as the Er2O3 content is increased. The glass transition temperature (Tg), crystallization temperature (Tc), melting temperature (Tm) and the temperature difference (Tc-Tg) are determined by means of Differential Thermal Analysis (DTA). It is found that the Tc, Tg and Tm are in the range of (419-430) oC, (300-345) oC and (885-890) oC respectively. Meanwhile, the vibrational study is conducted using the Infrared spectroscopy in the range of (4000-400) cm–1. Two major absorption peaks are observed around (1600-3600) cm–1, and (900-1200) cm–1 which are due to the stretching mode vibration of OH peak and Te-OH peak respectively. The optical absorption edge is studied using UV-Vis spectroscopy. The result shows that the optical band gap (Eopt) and Urbach Energy (?E) are in the range of (3.038-3.130) eV and (0.334-0.321) eV respectively, depending on the Er2O3 concentration. The refractive index is evaluated using the Sellmeier’s equation and it is found that the value in the visible region is in the range of 1.724-1.781 depending on the Er2O3 content. The emission spectrum is recorded using the photoluminescence spectrometer excited at 582 nm at room temperature. The result shows that the emission spectrum of Er3+ and Nd3+ consist of five emission bands at ~457 nm, ~495 nm, ~556 nm, ~611 nm, and ~ 665 nm which can be assigned as a transition of 4F7/2?4F15/2, 4S3/2?4F15/2, 4G11/2 ? 4I9/2, 4G11/2 ? 4I15/2 and 4G7/2 ? 4I13/2 respectively 2013 Thesis http://eprints.utm.my/id/eprint/48174/ http://eprints.utm.my/id/eprint/48174/1/SyaridatulAkmarMFS2013.pdf application/pdf en public http://dms.library.utm.my:8080/vital/access/manager/Repository/vital:83146?queryType=vitalDismax&query=Characterization+of+lithium-magnesium-tellurite+doped+with+erbium+and+neodymium+glass masters Universiti Teknologi Malaysia, Faculty of Science Faculty of Science
institution	Universiti Teknologi Malaysia
collection	UTM Institutional Repository
language	English
topic	TA Engineering (General) Civil engineering (General)
spellingShingle	TA Engineering (General) Civil engineering (General) Roslan, Syaridatul Akmar Characterization of lithium-magnesium-tellurite doped with erbium and neodymium glass
description	Tellurite glass based on (78-x)TeO2-10Li2O-10MgO-2Nd2O3-xEr2O3, (where x = 0.4 to 2.0 mol %) has successfully been prepared by melt-quenching technique. The colour of glass is found to vary from light violet to dark violet as the Er2O3 content is increased. No definite peaks are found from the X-ray diffraction pattern, which shows that the glass is amorphous in nature. It also found that the densities and the molar volume of the glass increase as the Er2O3 content is increased. The glass transition temperature (Tg), crystallization temperature (Tc), melting temperature (Tm) and the temperature difference (Tc-Tg) are determined by means of Differential Thermal Analysis (DTA). It is found that the Tc, Tg and Tm are in the range of (419-430) oC, (300-345) oC and (885-890) oC respectively. Meanwhile, the vibrational study is conducted using the Infrared spectroscopy in the range of (4000-400) cm–1. Two major absorption peaks are observed around (1600-3600) cm–1, and (900-1200) cm–1 which are due to the stretching mode vibration of OH peak and Te-OH peak respectively. The optical absorption edge is studied using UV-Vis spectroscopy. The result shows that the optical band gap (Eopt) and Urbach Energy (?E) are in the range of (3.038-3.130) eV and (0.334-0.321) eV respectively, depending on the Er2O3 concentration. The refractive index is evaluated using the Sellmeier’s equation and it is found that the value in the visible region is in the range of 1.724-1.781 depending on the Er2O3 content. The emission spectrum is recorded using the photoluminescence spectrometer excited at 582 nm at room temperature. The result shows that the emission spectrum of Er3+ and Nd3+ consist of five emission bands at ~457 nm, ~495 nm, ~556 nm, ~611 nm, and ~ 665 nm which can be assigned as a transition of 4F7/2?4F15/2, 4S3/2?4F15/2, 4G11/2 ? 4I9/2, 4G11/2 ? 4I15/2 and 4G7/2 ? 4I13/2 respectively
format	Thesis
qualification_level	Master's degree
author	Roslan, Syaridatul Akmar
author_facet	Roslan, Syaridatul Akmar
author_sort	Roslan, Syaridatul Akmar
title	Characterization of lithium-magnesium-tellurite doped with erbium and neodymium glass
title_short	Characterization of lithium-magnesium-tellurite doped with erbium and neodymium glass
title_full	Characterization of lithium-magnesium-tellurite doped with erbium and neodymium glass
title_fullStr	Characterization of lithium-magnesium-tellurite doped with erbium and neodymium glass
title_full_unstemmed	Characterization of lithium-magnesium-tellurite doped with erbium and neodymium glass
title_sort	characterization of lithium-magnesium-tellurite doped with erbium and neodymium glass
granting_institution	Universiti Teknologi Malaysia, Faculty of Science
granting_department	Faculty of Science
publishDate	2013
url	http://eprints.utm.my/id/eprint/48174/1/SyaridatulAkmarMFS2013.pdf
_version_	1747817325792329728

Characterization of lithium-magnesium-tellurite doped with erbium and neodymium glass

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