Physical and optical properties of lithium potassium borate glass doped with neodymium

A series of glass based on the composition of 20Li2CO3 : 10K2CO3 : (70-x)B2O3 : xNd2O3, where 0 = x = 1.3 mol % have been successfully prepared by conventional melt-quenching technique. The X-Ray Diffraction (XRD) spectra obtained confirmed the amorphous nature of the glass samples. The physical pro...

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Main Author:	Ibrahim, Siti Noor Hafizah
Format:	Thesis
Language:	English
Published:	2014
Subjects:	Q Science (General)
Online Access:	http://eprints.utm.my/id/eprint/39767/5/SitiNoorHafizahIbrahimMFS2014.pdf
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spelling	my-utm-ep.397672017-09-08T06:22:18Z Physical and optical properties of lithium potassium borate glass doped with neodymium 2014-01 Ibrahim, Siti Noor Hafizah Q Science (General) A series of glass based on the composition of 20Li2CO3 : 10K2CO3 : (70-x)B2O3 : xNd2O3, where 0 = x = 1.3 mol % have been successfully prepared by conventional melt-quenching technique. The X-Ray Diffraction (XRD) spectra obtained confirmed the amorphous nature of the glass samples. The physical properties which includes density, ion concentrations, polaron radius and inter-nuclear distance have been determined. The glass transition temperature, crystallization temperature and melting temperature were determined by using Differential Thermal Analysis (DTA). The thermal stability of the glasses were increased with successive increase of Nd2O3 concentration. Infrared spectra were recorded at room temperature from 400 – 4000 cm-1. The bands arising from the vibrations of the borate network were observed in the range of 500 – 1600 cm-1. Since no peaks is observed at 806 cm-1, there are no boroxol ring involved and the glass network structure were expected to consists of randomly connected BO3 and BO4 units. The absorption spectra obtained from UV-Vis-NIR spectroscopy revealed eight absorption peaks, with the highest intensity at 581 nm. The increment of dopant concentrations had increased the absorption intensity of the glass samples. Based on the absorption measurements, the optical band gap energy and refractive index have been determined. Energy band gap show a maximum for 0.7 mol % and a minimum for 0.3 mol % of Nd2O3 concentrations. While refractive index shows an opposite trend with energy band gap. Photoluminescence spectra of doped glass samples exhibits three emissions in visible region under 310 nm excitation wavelength. It is observed that a violet, blue and green emission occurred at 420 nm, 484 nm and 538 nm due to 2P1/2 ? 4I9/2, 4G9/2 ? 4I9/2 and 4G7/2 ? 4I9/2 transitions of neodymium ions, respectively. 2014-01 Thesis http://eprints.utm.my/id/eprint/39767/ http://eprints.utm.my/id/eprint/39767/5/SitiNoorHafizahIbrahimMFS2014.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)
spellingShingle	Q Science (General) Ibrahim, Siti Noor Hafizah Physical and optical properties of lithium potassium borate glass doped with neodymium
description	A series of glass based on the composition of 20Li2CO3 : 10K2CO3 : (70-x)B2O3 : xNd2O3, where 0 = x = 1.3 mol % have been successfully prepared by conventional melt-quenching technique. The X-Ray Diffraction (XRD) spectra obtained confirmed the amorphous nature of the glass samples. The physical properties which includes density, ion concentrations, polaron radius and inter-nuclear distance have been determined. The glass transition temperature, crystallization temperature and melting temperature were determined by using Differential Thermal Analysis (DTA). The thermal stability of the glasses were increased with successive increase of Nd2O3 concentration. Infrared spectra were recorded at room temperature from 400 – 4000 cm-1. The bands arising from the vibrations of the borate network were observed in the range of 500 – 1600 cm-1. Since no peaks is observed at 806 cm-1, there are no boroxol ring involved and the glass network structure were expected to consists of randomly connected BO3 and BO4 units. The absorption spectra obtained from UV-Vis-NIR spectroscopy revealed eight absorption peaks, with the highest intensity at 581 nm. The increment of dopant concentrations had increased the absorption intensity of the glass samples. Based on the absorption measurements, the optical band gap energy and refractive index have been determined. Energy band gap show a maximum for 0.7 mol % and a minimum for 0.3 mol % of Nd2O3 concentrations. While refractive index shows an opposite trend with energy band gap. Photoluminescence spectra of doped glass samples exhibits three emissions in visible region under 310 nm excitation wavelength. It is observed that a violet, blue and green emission occurred at 420 nm, 484 nm and 538 nm due to 2P1/2 ? 4I9/2, 4G9/2 ? 4I9/2 and 4G7/2 ? 4I9/2 transitions of neodymium ions, respectively.
format	Thesis
qualification_level	Master's degree
author	Ibrahim, Siti Noor Hafizah
author_facet	Ibrahim, Siti Noor Hafizah
author_sort	Ibrahim, Siti Noor Hafizah
title	Physical and optical properties of lithium potassium borate glass doped with neodymium
title_short	Physical and optical properties of lithium potassium borate glass doped with neodymium
title_full	Physical and optical properties of lithium potassium borate glass doped with neodymium
title_fullStr	Physical and optical properties of lithium potassium borate glass doped with neodymium
title_full_unstemmed	Physical and optical properties of lithium potassium borate glass doped with neodymium
title_sort	physical and optical properties of lithium potassium borate glass doped with neodymium
granting_institution	Universiti Teknologi Malaysia, Faculty of Science
granting_department	Faculty of Science
publishDate	2014
url	http://eprints.utm.my/id/eprint/39767/5/SitiNoorHafizahIbrahimMFS2014.pdf
_version_	1747816550518226944

Physical and optical properties of lithium potassium borate glass doped with neodymium

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