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Holmium concentration dependent structural and optical properties of zinc tellurite glass

This thesis examined the effects of Ho2O3 dopant concentration variation on the physical, optical, thermal and structural properties of zinc tellurite glass system. Glass with composition of (80 x) TeO2 20ZnO xHo2O3, where x = 0.0, 0.5, 1.0, 1.5 and 2.0 mol% were prepared using melt quenching method...

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Main Author: Gafar, Shairah
Format: Thesis
Language:English
Published: 2018
Subjects:
QC Physics
Online Access:http://eprints.utm.my/id/eprint/81426/1/ShairahGafarMFS2018.pdf
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spelling my.utm.814262019-08-23T04:07:20Z http://eprints.utm.my/id/eprint/81426/ Holmium concentration dependent structural and optical properties of zinc tellurite glass Gafar, Shairah QC Physics This thesis examined the effects of Ho2O3 dopant concentration variation on the physical, optical, thermal and structural properties of zinc tellurite glass system. Glass with composition of (80 x) TeO2 20ZnO xHo2O3, where x = 0.0, 0.5, 1.0, 1.5 and 2.0 mol% were prepared using melt quenching method. Samples were characterized by X-ray diffraction (XRD) measurement, Energy-dispersive X-ray (EDX) spectroscopy, Fourier Transform Infrared (FTIR) spectroscopy, Raman spectroscopy, Differential Thermal Analysis (DTA), Archimedes Method, UV-Visible-NIR (UV-Vis-NIR) spectrometer and Photoluminescence (PL) spectrometer. XRD pattern verified the amorphous nature of prepared sample. EDX spectra detected the presence of appropriate elements in the glass. FTIR spectra showed all the functional group such as Zn O, TeO4 and TeO3 in the range of 443 – 487, 654 – 675 and 760 – 763 cm-1 . Raman spectrum showed three bands at 463, 530 and 676 cm-1 of Te–O–Te linkages, TeO4 and TeO3 respectively. The DTA thermogram showed the peak for glass transition temperature, Tg (367 °C), melting temperature, Tm (632 °C) and crystallization temperature, Tc (458 °C). The density, ? and molar volume, Vm of the prepared glass sample was varied respectively in the range of 5.554 5.580 g cm-3 and 26.088 27.270 cm3 mol-1 with increase of Ho2O3 concentration. The absorption spectra showed seven bands centered at 418, 454, 480, 541, 646, 894 and 1155 nm which assigned to the transitions from the ground state to the excited 5G5, 5G6, 5 F3, 5 F4 + 5 S2, 5 F5, 5 I5 and 5 I6 levels of Ho3+. The indirect band gap energy, direct band gap energy and Urbach energy were varied from 3.31 – 3.36, 3.21 – 3.30 and 0.17 – 0.21 eV respectively with the changes of holmium concentration. The PL spectra displayed two peaks at 657 nm (red region) and 753 nm (NIR region) for 5 F5 5 I8 and 5 S2 5 I7 transitions. 2018 Thesis NonPeerReviewed application/pdf en http://eprints.utm.my/id/eprint/81426/1/ShairahGafarMFS2018.pdf Gafar, Shairah (2018) Holmium concentration dependent structural and optical properties of zinc tellurite glass. Masters thesis, Universiti Teknologi Malaysia. http://dms.library.utm.my:8080/vital/access/manager/Repository/vital:124856
institution Universiti Teknologi Malaysia
building UTM Library
collection Institutional Repository
continent Asia
country Malaysia
content_provider Universiti Teknologi Malaysia
content_source UTM Institutional Repository
url_provider http://eprints.utm.my/
language English
topic QC Physics
spellingShingle QC Physics
Gafar, Shairah
Holmium concentration dependent structural and optical properties of zinc tellurite glass
description This thesis examined the effects of Ho2O3 dopant concentration variation on the physical, optical, thermal and structural properties of zinc tellurite glass system. Glass with composition of (80 x) TeO2 20ZnO xHo2O3, where x = 0.0, 0.5, 1.0, 1.5 and 2.0 mol% were prepared using melt quenching method. Samples were characterized by X-ray diffraction (XRD) measurement, Energy-dispersive X-ray (EDX) spectroscopy, Fourier Transform Infrared (FTIR) spectroscopy, Raman spectroscopy, Differential Thermal Analysis (DTA), Archimedes Method, UV-Visible-NIR (UV-Vis-NIR) spectrometer and Photoluminescence (PL) spectrometer. XRD pattern verified the amorphous nature of prepared sample. EDX spectra detected the presence of appropriate elements in the glass. FTIR spectra showed all the functional group such as Zn O, TeO4 and TeO3 in the range of 443 – 487, 654 – 675 and 760 – 763 cm-1 . Raman spectrum showed three bands at 463, 530 and 676 cm-1 of Te–O–Te linkages, TeO4 and TeO3 respectively. The DTA thermogram showed the peak for glass transition temperature, Tg (367 °C), melting temperature, Tm (632 °C) and crystallization temperature, Tc (458 °C). The density, ? and molar volume, Vm of the prepared glass sample was varied respectively in the range of 5.554 5.580 g cm-3 and 26.088 27.270 cm3 mol-1 with increase of Ho2O3 concentration. The absorption spectra showed seven bands centered at 418, 454, 480, 541, 646, 894 and 1155 nm which assigned to the transitions from the ground state to the excited 5G5, 5G6, 5 F3, 5 F4 + 5 S2, 5 F5, 5 I5 and 5 I6 levels of Ho3+. The indirect band gap energy, direct band gap energy and Urbach energy were varied from 3.31 – 3.36, 3.21 – 3.30 and 0.17 – 0.21 eV respectively with the changes of holmium concentration. The PL spectra displayed two peaks at 657 nm (red region) and 753 nm (NIR region) for 5 F5 5 I8 and 5 S2 5 I7 transitions.
format Thesis
author Gafar, Shairah
author_facet Gafar, Shairah
author_sort Gafar, Shairah
title Holmium concentration dependent structural and optical properties of zinc tellurite glass
title_short Holmium concentration dependent structural and optical properties of zinc tellurite glass
title_full Holmium concentration dependent structural and optical properties of zinc tellurite glass
title_fullStr Holmium concentration dependent structural and optical properties of zinc tellurite glass
title_full_unstemmed Holmium concentration dependent structural and optical properties of zinc tellurite glass
title_sort holmium concentration dependent structural and optical properties of zinc tellurite glass
publishDate 2018
url http://eprints.utm.my/id/eprint/81426/1/ShairahGafarMFS2018.pdf
http://eprints.utm.my/id/eprint/81426/
http://dms.library.utm.my:8080/vital/access/manager/Repository/vital:124856
_version_ 1643658706678710272
score 13.211869

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