Fabrication and characterization of Yb : YAG transparent ceramics

Transparent polycrystalline ceramics are gaining popularity over their single crystal counterparts in laser ceramics. The popularity is due to the lower manufacturing costs, high manufacturing yield and flexibility to be doped with different types of rare-earth elements to achieve different microstr...

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Main Author: Chua, Kenet Wee Kang
Other Authors: Kong Ling Bing
Format: Final Year Project
Language:English
Published: 2018
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Online Access:http://hdl.handle.net/10356/74248
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Institution: Nanyang Technological University
Language: English
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spelling sg-ntu-dr.10356-742482023-03-04T15:36:39Z Fabrication and characterization of Yb : YAG transparent ceramics Chua, Kenet Wee Kang Kong Ling Bing School of Materials Science and Engineering DRNTU::Science Transparent polycrystalline ceramics are gaining popularity over their single crystal counterparts in laser ceramics. The popularity is due to the lower manufacturing costs, high manufacturing yield and flexibility to be doped with different types of rare-earth elements to achieve different microstructural properties and high optical transmittance. To study the effects of dopant concentration on morphological properties and optical transmittance, yttrium aluminum garnet doped with 1 at%, 3 at%, 5 at%, 10 at% ytterbium was fabricated using solid state reaction, dry pressing to obtain a green body and vacuum sintering. Samples were polished and characterized using UV-vis spectrophotometry, scanning electron microscopy (SEM) and X-ray diffraction spectroscopy (XRD).Results obtained from the characterization methods were analysed and compared with studies that were previously done. From the SEM images, the samples show an almost pore-free microstructure. It can also be observed that the average grain size of the samples decreases with increasing doping concentration, creating more grain boundaries which serve as light scattering sources. The spectrophotometry results have confirmed that increasing doping concentration increases the amount of grain boundaries, leading to lesser optical transmittance. XRD patterns have confirmed that the samples have pure garnet phase. Analysing the results, it can be concluded that the optimum doping concentration is 1 at% ytterbium to produce sample with high optical transmittance and it is vital to have an almost pore-free micro-structure to produce a high-quality laser ceramic. Bachelor of Engineering (Materials Engineering) 2018-05-14T05:32:41Z 2018-05-14T05:32:41Z 2018 Final Year Project (FYP) http://hdl.handle.net/10356/74248 en Nanyang Technological University 41 p. application/pdf
institution Nanyang Technological University
building NTU Library
continent Asia
country Singapore
Singapore
content_provider NTU Library
collection DR-NTU
language English
topic DRNTU::Science
spellingShingle DRNTU::Science
Chua, Kenet Wee Kang
Fabrication and characterization of Yb : YAG transparent ceramics
description Transparent polycrystalline ceramics are gaining popularity over their single crystal counterparts in laser ceramics. The popularity is due to the lower manufacturing costs, high manufacturing yield and flexibility to be doped with different types of rare-earth elements to achieve different microstructural properties and high optical transmittance. To study the effects of dopant concentration on morphological properties and optical transmittance, yttrium aluminum garnet doped with 1 at%, 3 at%, 5 at%, 10 at% ytterbium was fabricated using solid state reaction, dry pressing to obtain a green body and vacuum sintering. Samples were polished and characterized using UV-vis spectrophotometry, scanning electron microscopy (SEM) and X-ray diffraction spectroscopy (XRD).Results obtained from the characterization methods were analysed and compared with studies that were previously done. From the SEM images, the samples show an almost pore-free microstructure. It can also be observed that the average grain size of the samples decreases with increasing doping concentration, creating more grain boundaries which serve as light scattering sources. The spectrophotometry results have confirmed that increasing doping concentration increases the amount of grain boundaries, leading to lesser optical transmittance. XRD patterns have confirmed that the samples have pure garnet phase. Analysing the results, it can be concluded that the optimum doping concentration is 1 at% ytterbium to produce sample with high optical transmittance and it is vital to have an almost pore-free micro-structure to produce a high-quality laser ceramic.
author2 Kong Ling Bing
author_facet Kong Ling Bing
Chua, Kenet Wee Kang
format Final Year Project
author Chua, Kenet Wee Kang
author_sort Chua, Kenet Wee Kang
title Fabrication and characterization of Yb : YAG transparent ceramics
title_short Fabrication and characterization of Yb : YAG transparent ceramics
title_full Fabrication and characterization of Yb : YAG transparent ceramics
title_fullStr Fabrication and characterization of Yb : YAG transparent ceramics
title_full_unstemmed Fabrication and characterization of Yb : YAG transparent ceramics
title_sort fabrication and characterization of yb : yag transparent ceramics
publishDate 2018
url http://hdl.handle.net/10356/74248
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