Thermal, structural and optical properties of lithium niobate tellurite glass doped erbium and neodymium

A series of tellurite glasses of composition (70–x–y)TeO2–15Li2CO3–15Nb2O5–xEr2O3–yNd2O3 doped Er3+ and Nd3+, with x=0, 1.0 mol%; 0 ≤ y ≤1.0 mol% were prepared by using melt quenching technique. The glass phase and thermal behaviour were investigated using X-ray diffraction (XRD) and differential th...

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Main Author:	Hasim, Nurhafizah
Format:	Thesis
Language:	English
Published:	2014
Subjects:	QD Chemistry
Online Access:	http://eprints.utm.my/id/eprint/48657/1/NurhafizahHasimMFS2014.pdf
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spelling	my-utm-ep.486572020-06-01T08:16:31Z Thermal, structural and optical properties of lithium niobate tellurite glass doped erbium and neodymium 2014 Hasim, Nurhafizah QD Chemistry A series of tellurite glasses of composition (70–x–y)TeO2–15Li2CO3–15Nb2O5–xEr2O3–yNd2O3 doped Er3+ and Nd3+, with x=0, 1.0 mol%; 0 ≤ y ≤1.0 mol% were prepared by using melt quenching technique. The glass phase and thermal behaviour were investigated using X-ray diffraction (XRD) and differential thermal analysis (DTA) while the structural and optical properties were investigated using Fourier transform infrared spectroscopy (FTIR), ultraviolet–visible–near infrared spectroscopy (UV–VIS–NIR) and photoluminescence spectroscopy. The XRD spectra confirmed that the glass was amorphous as no sharp peaks were observed. The thermal parameters particularly the thermal stability is around 291.5°C and Hruby criterion of around 0.82 to 0.93. The structural properties of the glass represented by the FTIR spectrum indicate that as Nd2O3 content increases, the sharp infrared absorption peaks shifted from 474.7 cm-1 to 499.4 cm-1. These peaks are due to Nb–O, Te–O–Te and O–Te–O bond linkage bending vibration. For TeO4 trigonal bipyramid, the peak occurred at 676.5 cm-1 whereas for TeO3 trigonal pyramid, two infrared band peaks were observed at 787.5 cm-1 and 887.6 cm-1. The absorption peaks around 1382.7 cm-1 is due to the Te–O–Nb stretching vibration while peaks at 1635.5 cm-1 and 3411.7 cm-1 are due to the stretching vibrations of the hydroxyl group participating in the strong metal bonding as well as in the hydrogen bonding, respectively. The UV–VIS–NIR spectrum exhibits absorption peaks corresponding to transitions from both ground state of Erbium, 4I15/2 to the excited state of 4F7/2, 2H11/2, 4S3/2, 4I9/2, 2H9/2, 4I11/2, 4I3/2 and 4I13/2 and Neodymium, 4I9/2 to the excited state of 2G11/2, 2G9/2, 2G7/2, 4F9/2, 4I3/2 and 4I15/2. The up conversion was observed in the luminescence spectra by the red emission at around 633 nm which is due to the transition from 4F9/2 4I9/2. The down conversion was represented by the green emission at 497 nm due to transition from 2G9/2→4I9/2. 2014 Thesis http://eprints.utm.my/id/eprint/48657/ http://eprints.utm.my/id/eprint/48657/1/NurhafizahHasimMFS2014.pdf application/pdf en public http://dms.library.utm.my:8080/vital/access/manager/Repository/vital:83771?queryType=vitalDismax&query=Thermal%2C+structural+and+optical+properties+of+lithium+niobate+tellurite+glass+doped+erbium+and+neodymium&public=true masters Universiti Teknologi Malaysia, Faculty of Science Faculty of Science
institution	Universiti Teknologi Malaysia
collection	UTM Institutional Repository
language	English
topic	QD Chemistry
spellingShingle	QD Chemistry Hasim, Nurhafizah Thermal, structural and optical properties of lithium niobate tellurite glass doped erbium and neodymium
description	A series of tellurite glasses of composition (70–x–y)TeO2–15Li2CO3–15Nb2O5–xEr2O3–yNd2O3 doped Er3+ and Nd3+, with x=0, 1.0 mol%; 0 ≤ y ≤1.0 mol% were prepared by using melt quenching technique. The glass phase and thermal behaviour were investigated using X-ray diffraction (XRD) and differential thermal analysis (DTA) while the structural and optical properties were investigated using Fourier transform infrared spectroscopy (FTIR), ultraviolet–visible–near infrared spectroscopy (UV–VIS–NIR) and photoluminescence spectroscopy. The XRD spectra confirmed that the glass was amorphous as no sharp peaks were observed. The thermal parameters particularly the thermal stability is around 291.5°C and Hruby criterion of around 0.82 to 0.93. The structural properties of the glass represented by the FTIR spectrum indicate that as Nd2O3 content increases, the sharp infrared absorption peaks shifted from 474.7 cm-1 to 499.4 cm-1. These peaks are due to Nb–O, Te–O–Te and O–Te–O bond linkage bending vibration. For TeO4 trigonal bipyramid, the peak occurred at 676.5 cm-1 whereas for TeO3 trigonal pyramid, two infrared band peaks were observed at 787.5 cm-1 and 887.6 cm-1. The absorption peaks around 1382.7 cm-1 is due to the Te–O–Nb stretching vibration while peaks at 1635.5 cm-1 and 3411.7 cm-1 are due to the stretching vibrations of the hydroxyl group participating in the strong metal bonding as well as in the hydrogen bonding, respectively. The UV–VIS–NIR spectrum exhibits absorption peaks corresponding to transitions from both ground state of Erbium, 4I15/2 to the excited state of 4F7/2, 2H11/2, 4S3/2, 4I9/2, 2H9/2, 4I11/2, 4I3/2 and 4I13/2 and Neodymium, 4I9/2 to the excited state of 2G11/2, 2G9/2, 2G7/2, 4F9/2, 4I3/2 and 4I15/2. The up conversion was observed in the luminescence spectra by the red emission at around 633 nm which is due to the transition from 4F9/2 4I9/2. The down conversion was represented by the green emission at 497 nm due to transition from 2G9/2→4I9/2.
format	Thesis
qualification_level	Master's degree
author	Hasim, Nurhafizah
author_facet	Hasim, Nurhafizah
author_sort	Hasim, Nurhafizah
title	Thermal, structural and optical properties of lithium niobate tellurite glass doped erbium and neodymium
title_short	Thermal, structural and optical properties of lithium niobate tellurite glass doped erbium and neodymium
title_full	Thermal, structural and optical properties of lithium niobate tellurite glass doped erbium and neodymium
title_fullStr	Thermal, structural and optical properties of lithium niobate tellurite glass doped erbium and neodymium
title_full_unstemmed	Thermal, structural and optical properties of lithium niobate tellurite glass doped erbium and neodymium
title_sort	thermal, structural and optical properties of lithium niobate tellurite glass doped erbium and neodymium
granting_institution	Universiti Teknologi Malaysia, Faculty of Science
granting_department	Faculty of Science
publishDate	2014
url	http://eprints.utm.my/id/eprint/48657/1/NurhafizahHasimMFS2014.pdf
_version_	1747817443924901888

Thermal, structural and optical properties of lithium niobate tellurite glass doped erbium and neodymium

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