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研究生： Temesgen
Temesgen Yiber Animut
論文名稱： 製備與分析噴霧熱裂解Mg2SiO4粉體
Preparation and Characterization of Spray Pyrolyzed Mg2SiO4
指導教授： 施劭儒
Shao-Ju Shih
口試委員: 王丞浩
Wang Cheng hao
游進陽
You Jinyang
施劭儒
Shao-Ju Shih
楊永欽
Yang Yongqin
邱德威
Qiu Dewei
學位類別： 博士
Doctor
系所名稱： 工程學院 - 材料科學與工程系
Department of Materials Science and Engineering
論文出版年： 2023
畢業學年度： 111
語文別： 英文
論文頁數： 98
中文關鍵詞： 矽酸鎂 、形貌 、噴霧熱裂解法 、5G 、電子顯微鏡
外文關鍵詞： Mg2SiO4, morphology, spray pyrolysis, 5G, electron microscopy
相關次數： 點閱：332  下載：1 
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  •  上一筆

    • 近年來，矽酸鎂(Mg2SiO4) 已被應用於耐火材料、植骨材料及微波介電材料上。眾多無線通訊技術已發展在微米波，為此，陶瓷材料在微波通訊上之應用更為重要。本研究包含利用噴霧熱裂解法生產純矽酸鎂球型粉體；利用X繞射儀確認成功合成純相矽酸鎂；利用掃描式電子顯微鏡及電子能量散佈確認矽酸鎂粉體之形貌及元素組成。本研究第一部分為使用矽酸四乙酯及硝酸鎂六水合物作為矽及鎂的前驅液，經由噴霧熱裂解法在不同煅燒溫度(850、900、950及1000℃) 合成矽酸鎂。第二部分為使用相同前驅物在不同前驅液濃度(0.10、0.25、1.00及2.00M) 之條件下，合成矽酸鎂。第三部分針對前驅液濃度及煅燒溫度進行討論並選擇最佳參數，研究顯示在煅燒溫度900℃及前驅液濃度2. 00M下為最佳參數。最終，藉由燒結及分析得到具有低力。介電常數及高品質因子之矽酸鎂陶瓷材料，對於未來應用於行動裝置通訊及基板材料及具潛

    Forsterite (Mg2SiO4) materials have been employed in industrial applications such as refractory materials, bone grafting materials, and microwave dielectric materials. Many wireless communication technologies have recently been developed for millimeter-wave to kilometer-wave applications. For such applications ceramic materials are crucial. The results obtained that the spray pyrolysis approach produces pure Mg2SiO4 powders and spherical morphology. X-ray powder diffraction (XRD) confirmed that the phase composition of Mg2SiO4 was shown as a single phase. The morphology and elemental content of sintered Mg2SiO4 powders were studied using SEM-EDS analysis. In the first experiment, utilizing tetra ethyl ortho-silicate and magnesium nitrate hexahydrate as silicon and magnesium precursors, respectively, and varying calcination temperatures (850, 900, 950, and 1000 °C), we synthesized Mg2SiO4 using spray pyrolysis. In the second experiment, we employed the same materials as in the first but with different precursor concentrations (0.10, 0.25, 1.00 and 2.00M) utilizing spray pyrolysis. The final section of the thesis discusses the identification of the optimal precursor concentration and calcination temperatures. The calcination temperature of 900 °C and the precursor concentration of 2 M are the optimum conditions for the study. Next, we performed the sintering and analysis that might be used by Mg2SiO4 ceramics with low permittivity and high Q-value, which have been extensively investigated because of their potential use as substrate materials and substantial advancements in mobile communication.

    Abstract i 摘要 ii Acknowledgements iii Table of Contents iv List of Figures vii List of Tables x Chapter 1. Introduction 1 1.1 Motivation and Objectives of the Study 6 Chapter 2. Literature Review 7 2.1 Electroceramics and Forsterite (Mg2SiO4) based Materials 7 2.1.1. Forsterite (Mg2SiO4) 7 2.1.2. Structure of forsterite (Mg2SiO4) 10 2.1.3. Significances and properties of forsterite (Mg2SiO4) 12 2.2 The Synthesis Technique 13 Chapter 3. Materials and Experimental Method 14 3.1 Experimental materials and instruments 14 3.2 Chemicals 14 3.3 Materials preparation 15 3.3.1. Preparations of forsterite (Mg2SiO4) powder in various calcination temperatures 15 3.3.2. Preparations of forsterite (Mg2SiO4) powder in various precursor concentrations 17 3.4 Synthesis method 19 3.4.1. Spray pyrolysis (SP) 19 3.4.1.1. Schematic equipment of spray pyrolysis 20 3.4.1.2. Atomization stage 20 3.4.1.3. Thermal stage 21 3.4.1.4. Electrostatic deposition 21 3.4.2. Formation of particles during spray pyrolysis 22 3.5 Characterization techniques 24 3.5.1. X-ray diffraction technique 24 3.5.1.1. Generation of X-rays 24 3.5.1.2. Characteristic X-ray 27 3.5.1.3. Bragg’s law 27 3.5.2. Scanning electron microscopy (FE-SEM) 28 3.5.2.1. Working principle of scanning electron microscope 29 3.5.2.2. Electron gun 31 3.5.2.3. Interactions of electrons and specimen 32 3.5.3. Transmission Electron Microscope (TEM) 33 3.5.3.1. Beam energy and resolution 34 3.5.3.2. Images contrast of TEM 35 3.5.3.3. Mass-density contrast 35 3.5.3.4. Diffraction contrast 35 3.5.3.5. Phase contrast 36 3.5.4. Brunauer- emmett teller (BET) 36 3.5.5. Fourier transforms infrared spectroscopy (FTIR) 37 3.5.6. Thermogravimetric analysis (TGA) 37 3.6 Dielectric constant and 5G mobile communication 37 3.6.1 Features and challenges of 5G networks 37 3.6.2 Performance requirements for 5G network components 38 Chapter 4. Experimental results 39 4.1 Synthesis of Forsterite (Mg2SiO4) at various calcination temperatures 39 4.1.1 XRD analysis 39 4.1.2 SEM analysis 41 4.1.3 EDS analysis 47 4.1.4 BET analysis 48 4.1.4 TEM analysis 50 4.1.5 FTIR analysis 51 4.2 Synthesis of forsterite (Mg2SiO4) in various precursor solution concentrations 51 4.2.1 XRD analysis 51 4.2.2 SEM analysis 53 4.2.3 EDS analysis 59 4.2.4 BET analysis 60 4.2.5 TEM analysis 62 4.2.6 FTIR analysis 63 Chapter 5. Discussion 64 5.1 Effect of various calcination temperatures and precursor concentrations 64 5.2 Forsterite (Mg2SiO4) powder in various calcination temperatures 65 5.2.1 Particle formation mechanism 65 5.2.2 Correlation between morphology and particle size 66 5.2.3 Correlation between calcination temperature, crystallite size and specific surface area 66 5.2.4 Correlation between calcination temperature, particle size and specific surface area 67 5.3 Forsterite (Mg2SiO4) powder in various precursor solution concentration 68 5.3.1 Correlation between morphology and particle size 68 5.3.2 Correlation between precursor solution concentration, crystallite size and specific surface area 68 5.3.3 Correlation between precursor solution concentration, particle size and specific surface area 69 5.4 Correlation between sintering temperature and relative density 70 5.5 Correlation between sintering temperature, frequency and dielectric constant 71 5.6 Correlation between quality factor, dielectric constant and sintering temperature 72 Chapter 6. Conclusion 74 6.1 Effect of various calcination temperatures and precursor concentrations 74 6.2 Mg2SiO4 powders with a variety of calcination temperatures 76 6.3 Mg2SiO4 powders with a variety of precursor solution concentrations 76 Chapter 7. Future works 77 References 78

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