Optical and thermal properties of neodymium doped tellurite nanostructured glass

Neodymium doped tellurite nanostructured glass having a composition of (75-x)TeO2-15MgO-10Na2O-(x)Nd2O3, where 0 = x = 2.5 mol% has successfully been prepared by melt-quenching technique. The amorphous nature of the glass was confirmed from the X-ray diffraction pattern. Thermal parameter of the gla...

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Main Author:	Mat Jan, Nur Amanina
Format:	Thesis
Language:	English
Published:	2014
Subjects:	Q Science (General) QC Physics
Online Access:	http://eprints.utm.my/id/eprint/48008/25/NurAmaninaMatJanMFS2014.pdf
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spelling	my-utm-ep.480082017-08-11T06:26:59Z Optical and thermal properties of neodymium doped tellurite nanostructured glass 2014-05 Mat Jan, Nur Amanina Q Science (General) QC Physics Neodymium doped tellurite nanostructured glass having a composition of (75-x)TeO2-15MgO-10Na2O-(x)Nd2O3, where 0 = x = 2.5 mol% has successfully been prepared by melt-quenching technique. The amorphous nature of the glass was confirmed from the X-ray diffraction pattern. Thermal parameter of the glass was analyzed by using differential thermal analysis. It was found that the glass exhibits the transition temperature between 255 - 259 oC, crystallization temperature between 428 to 450 oC and melting temperature from 505 to 549 oC. The nanoparticles were obtained by applying heat treatment to the glass at near crystallisation temperature of 460 oC for 30 minutes. The existence of nanocrystalline nature of this glass was confirmed by X-ray diffraction and transmission electron microscopy. The vibrational study was conducted using Fourier transform infrared spectroscopy in the range 4000 - 400 cm-1. It was found that there were three absorption peaks around 687 - 712 cm-1, 624 - 632 cm-1 and 467 - 474 cm-1 which are due to the stretching of Te-O bending in TeO3 trigonal pyramidal (tp) units, Te-O bands stretching vibration in TeO4 trigonal bipyramidal (tbp) units and the bending vibrations of Te-O-Te or OTe- O linkages, respectively. The optical absorption behaviour was studied using UVVisible spectrophotometer. The values of indirect optical band gap are in the range 3.15 - 3.22 eV and for direct band gap the values are in the range 3.37 - 3.43 eV. The Urbach energy value for glass system was found to be in range 0.208 eV and 0.125 eV. The emission spectrum was recorded using photoluminescence spectrometer. The fluorescence spectra of Nd3+ ions exhibit emission transition of 2P1/2?4I9/2, 2D3/2?4I9/2 and 4G7/2?4I9/2 under 585 nm excitation wavelengths. It was found that the intensity is enhanced in the heat-treated glass compared to those of prepared glass. 2014-05 Thesis http://eprints.utm.my/id/eprint/48008/ http://eprints.utm.my/id/eprint/48008/25/NurAmaninaMatJanMFS2014.pdf application/pdf en public masters Universiti Teknologi Malaysia, Faculty of Science Faculty of Science
institution	Universiti Teknologi Malaysia
collection	UTM Institutional Repository
language	English
topic	Q Science (General) QC Physics
spellingShingle	Q Science (General) QC Physics Mat Jan, Nur Amanina Optical and thermal properties of neodymium doped tellurite nanostructured glass
description	Neodymium doped tellurite nanostructured glass having a composition of (75-x)TeO2-15MgO-10Na2O-(x)Nd2O3, where 0 = x = 2.5 mol% has successfully been prepared by melt-quenching technique. The amorphous nature of the glass was confirmed from the X-ray diffraction pattern. Thermal parameter of the glass was analyzed by using differential thermal analysis. It was found that the glass exhibits the transition temperature between 255 - 259 oC, crystallization temperature between 428 to 450 oC and melting temperature from 505 to 549 oC. The nanoparticles were obtained by applying heat treatment to the glass at near crystallisation temperature of 460 oC for 30 minutes. The existence of nanocrystalline nature of this glass was confirmed by X-ray diffraction and transmission electron microscopy. The vibrational study was conducted using Fourier transform infrared spectroscopy in the range 4000 - 400 cm-1. It was found that there were three absorption peaks around 687 - 712 cm-1, 624 - 632 cm-1 and 467 - 474 cm-1 which are due to the stretching of Te-O bending in TeO3 trigonal pyramidal (tp) units, Te-O bands stretching vibration in TeO4 trigonal bipyramidal (tbp) units and the bending vibrations of Te-O-Te or OTe- O linkages, respectively. The optical absorption behaviour was studied using UVVisible spectrophotometer. The values of indirect optical band gap are in the range 3.15 - 3.22 eV and for direct band gap the values are in the range 3.37 - 3.43 eV. The Urbach energy value for glass system was found to be in range 0.208 eV and 0.125 eV. The emission spectrum was recorded using photoluminescence spectrometer. The fluorescence spectra of Nd3+ ions exhibit emission transition of 2P1/2?4I9/2, 2D3/2?4I9/2 and 4G7/2?4I9/2 under 585 nm excitation wavelengths. It was found that the intensity is enhanced in the heat-treated glass compared to those of prepared glass.
format	Thesis
qualification_level	Master's degree
author	Mat Jan, Nur Amanina
author_facet	Mat Jan, Nur Amanina
author_sort	Mat Jan, Nur Amanina
title	Optical and thermal properties of neodymium doped tellurite nanostructured glass
title_short	Optical and thermal properties of neodymium doped tellurite nanostructured glass
title_full	Optical and thermal properties of neodymium doped tellurite nanostructured glass
title_fullStr	Optical and thermal properties of neodymium doped tellurite nanostructured glass
title_full_unstemmed	Optical and thermal properties of neodymium doped tellurite nanostructured glass
title_sort	optical and thermal properties of neodymium doped tellurite nanostructured glass
granting_institution	Universiti Teknologi Malaysia, Faculty of Science
granting_department	Faculty of Science
publishDate	2014
url	http://eprints.utm.my/id/eprint/48008/25/NurAmaninaMatJanMFS2014.pdf
_version_	1747817285339316224

Optical and thermal properties of neodymium doped tellurite nanostructured glass

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