Physical, structural and optical properties of willemite- based glass-ceramic doped with manganese oxide

Over the last few decades, great deals of interest have been focused on the fabrication and synthesizing willemite based ceramic. However, only few of them used waste materials to fabricate the willemite in form of glass-ceramic. This research was carried out based on several objectives such as to s...

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Main Author:	Mohd Zaid, Mohd Hafiz
Format:	Thesis
Language:	English
Published:	2016
Subjects:	Glass-ceramics - Effect of heat on Manganese oxides Zinc ores
Online Access:	http://psasir.upm.edu.my/id/eprint/75436/1/FS%202016%205%20IR.pdf
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spelling	my-upm-ir.754362019-10-18T07:17:32Z Physical, structural and optical properties of willemite- based glass-ceramic doped with manganese oxide 2016-05 Mohd Zaid, Mohd Hafiz Over the last few decades, great deals of interest have been focused on the fabrication and synthesizing willemite based ceramic. However, only few of them used waste materials to fabricate the willemite in form of glass-ceramic. This research was carried out based on several objectives such as to synthesis and study the effect of ZnO addition on the physical, structure and optical properties of soda lime silica (SLS) glass system. Besides, this work also investigation the effect of various heat treatment temperatures on the physical, structure and optical of precursor glass and glass-ceramics and the influence of MnO doping on the physical, structure and optical properties of willemite based glass-ceramics. Thus, in this study, willemite based glass-ceramics were fabricate and synthesized using SLS glass waste as a source of silicon. A series of precursor glasses in the ZnO-SLS glass system was prepared by the conventional melt-quench technique. Willemite based glass-ceramics were derived from the selected precursor ZnO-SLS glass by a controlled crystallization process. The thermal, chemical and physical properties of precursor glass and glass-ceramics were measured by differential thermal analysis (DTA), energy dispersive X-ray fluorescence (EDXRF), average density and linear shrinkage measurement. The average density and linear shrinkage of glass and glassceramic samples were found increased with increasing of heat treatment temperature and concentration of dopant. Besides, the structural properties of precursor glass and formation of willemite crystal phase, morphology and size with increase in heattreatment temperatures was examined by X-ray diffraction (XRD) and field-emission scanning electron microscopy (FESEM) techniques. The average calculated crystallite size obtained from XRD was found to be in the range 30-60 nm whereas the grain size observed in FESEM was 300-700 nm. Fourier transform infrared (FTIR) reflection spectroscopy was used to evaluate the structural of glass and glassceramics. The appearance of SiO2, ZnO4 and Zn-O-Si bands detected from FTIR measurements indicate that the formation of willemite crystal phase. The study of the optical band gap has found that optical band gap of glass and glass-ceramics decreased as the percentage of dopant and heat treatment temperature increased. The photoluminescence spectra of Mn2+ ions exhibit emission transitions of ⁴T1(G) - ⁶A1(S) and its excitation spectra show an intense absorption band at 260 nm. Prominent green emission colors of α-Zn₂SiO₄ phase were observed centered at 525 nm while the yellow emission centered at 585 nm resulted from β-Zn₂SiO₄ phase. These spectra reveal that the luminescence performance of the glass-ceramics is increase with the progression of dopant percentage and heat treatment temperatures. This enhancement is caused by partitioning of Mn²+ ions into the willemite crystals with progress of heat treatment temperatures. Such luminescent glass-ceramics are expected to find potential applications in phosphors and opto-electronic devices. Glass-ceramics - Effect of heat on Manganese oxides Zinc ores 2016-05 Thesis http://psasir.upm.edu.my/id/eprint/75436/ http://psasir.upm.edu.my/id/eprint/75436/1/FS%202016%205%20IR.pdf text en public doctoral Universiti Putra Malaysia Glass-ceramics - Effect of heat on Manganese oxides Zinc ores
institution	Universiti Putra Malaysia
collection	PSAS Institutional Repository
language	English
topic	Glass-ceramics - Effect of heat on Manganese oxides Zinc ores
spellingShingle	Glass-ceramics - Effect of heat on Manganese oxides Zinc ores Mohd Zaid, Mohd Hafiz Physical, structural and optical properties of willemite- based glass-ceramic doped with manganese oxide
description	Over the last few decades, great deals of interest have been focused on the fabrication and synthesizing willemite based ceramic. However, only few of them used waste materials to fabricate the willemite in form of glass-ceramic. This research was carried out based on several objectives such as to synthesis and study the effect of ZnO addition on the physical, structure and optical properties of soda lime silica (SLS) glass system. Besides, this work also investigation the effect of various heat treatment temperatures on the physical, structure and optical of precursor glass and glass-ceramics and the influence of MnO doping on the physical, structure and optical properties of willemite based glass-ceramics. Thus, in this study, willemite based glass-ceramics were fabricate and synthesized using SLS glass waste as a source of silicon. A series of precursor glasses in the ZnO-SLS glass system was prepared by the conventional melt-quench technique. Willemite based glass-ceramics were derived from the selected precursor ZnO-SLS glass by a controlled crystallization process. The thermal, chemical and physical properties of precursor glass and glass-ceramics were measured by differential thermal analysis (DTA), energy dispersive X-ray fluorescence (EDXRF), average density and linear shrinkage measurement. The average density and linear shrinkage of glass and glassceramic samples were found increased with increasing of heat treatment temperature and concentration of dopant. Besides, the structural properties of precursor glass and formation of willemite crystal phase, morphology and size with increase in heattreatment temperatures was examined by X-ray diffraction (XRD) and field-emission scanning electron microscopy (FESEM) techniques. The average calculated crystallite size obtained from XRD was found to be in the range 30-60 nm whereas the grain size observed in FESEM was 300-700 nm. Fourier transform infrared (FTIR) reflection spectroscopy was used to evaluate the structural of glass and glassceramics. The appearance of SiO2, ZnO4 and Zn-O-Si bands detected from FTIR measurements indicate that the formation of willemite crystal phase. The study of the optical band gap has found that optical band gap of glass and glass-ceramics decreased as the percentage of dopant and heat treatment temperature increased. The photoluminescence spectra of Mn2+ ions exhibit emission transitions of ⁴T1(G) - ⁶A1(S) and its excitation spectra show an intense absorption band at 260 nm. Prominent green emission colors of α-Zn₂SiO₄ phase were observed centered at 525 nm while the yellow emission centered at 585 nm resulted from β-Zn₂SiO₄ phase. These spectra reveal that the luminescence performance of the glass-ceramics is increase with the progression of dopant percentage and heat treatment temperatures. This enhancement is caused by partitioning of Mn²+ ions into the willemite crystals with progress of heat treatment temperatures. Such luminescent glass-ceramics are expected to find potential applications in phosphors and opto-electronic devices.
format	Thesis
qualification_level	Doctorate
author	Mohd Zaid, Mohd Hafiz
author_facet	Mohd Zaid, Mohd Hafiz
author_sort	Mohd Zaid, Mohd Hafiz
title	Physical, structural and optical properties of willemite- based glass-ceramic doped with manganese oxide
title_short	Physical, structural and optical properties of willemite- based glass-ceramic doped with manganese oxide
title_full	Physical, structural and optical properties of willemite- based glass-ceramic doped with manganese oxide
title_fullStr	Physical, structural and optical properties of willemite- based glass-ceramic doped with manganese oxide
title_full_unstemmed	Physical, structural and optical properties of willemite- based glass-ceramic doped with manganese oxide
title_sort	physical, structural and optical properties of willemite- based glass-ceramic doped with manganese oxide
granting_institution	Universiti Putra Malaysia
publishDate	2016
url	http://psasir.upm.edu.my/id/eprint/75436/1/FS%202016%205%20IR.pdf
_version_	1747813050867515392

Physical, structural and optical properties of willemite- based glass-ceramic doped with manganese oxide

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