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| ???org.dspace.app.webui.jsptag.ItemTag.dcfield??? | Value | Language |
|---|---|---|
| dc.contributor.advisor | 段維新 | zh_TW |
| dc.contributor.author | 蘇奕廷 | zh_TW |
| dc.contributor.author | Yi-Ting Su | en |
| dc.date.accessioned | 2021-07-11T15:27:32Z | - |
| dc.date.available | 2024-07-23 | - |
| dc.date.copyright | 2019-07-23 | - |
| dc.date.issued | 2018 | - |
| dc.date.submitted | 2002-01-01 | - |
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Cannell, Structure–microwave property relations in (SrxCa(1− x))n+1TinO3n+ 1, Journal of the European Ceramic Society, 21 (2001) 1723-1726. [39] R.A. Parker, Static Dielectric Constant of Rutile (TiO2), 1.6-1060° K, Physical Review, 124 (1961) 1719. [40] F. Liu, X.-Y. Liu, C.-L. Yuan, T. Yang, G.-H. Chen, C.-R. Zhou, Crystal structure and dielectric properties of (1− x) SrTiO3-xCa0. 4Sm0. 4TiO3 ceramic system at microwave frequencies, Materials Chemistry and Physics, 148 (2014) 1083-1088. [41] C.-L. Huang, J.-Y. Chen, C.-C. Liang, Dielectric properties and mixture behavior of Mg4Nb2O9–SrTiO3 ceramic system at microwave frequency, Journal of Alloys and Compounds, 478 (2009) 554-558. [42] P.-h. Sun, T. Nakamura, Y.J. Shan, Y. Inaguma, M. Itoh, T. Kitamura, Dielectric behavior of (1-x) LaAlO3–xSrTiO3 solid solution system at microwave frequencies, Japanese journal of applied physics, 37 (1998) 5625. [43] W.W. Cho, K.-i. Kakimoto, H. Ohsato, High-Q microwave dielectric SrTiO3-doped MgTiO3 materials with near-zero temperature coefficient of resonant frequency, Japanese journal of applied physics, 43 (2004) 6221. [44] Y.-B. Chen, New dielectric material system of Nd (Mg1/2Ti1/2)O3–SrTiO3 in the microwave frequency range, Journal of Alloys and Compounds, 509 (2011) 2285-2288. [45] G.J. McCarthy, W.B. White, R. Roy, Phase Equilibria in the 1375° C Isotherm of the System Sr‐Ti‐O, Journal of the American Ceramic Society, 52 (1969) 463-467. [46] K. Jacob, G. Rajitha, Thermodynamic properties of strontium titanates: Sr2TiO4, Sr3Ti2O7, Sr4Ti3O10, and SrTiO3, The Journal of Chemical Thermodynamics, 43 (2011) 51-57. [47] W. Maus-Friedrichs, B. Lesage, O. KaıØtasov, S. Hoffmann-Eiferte, T. Schneller, Sr diffusion in undoped and La-doped SrTiO3 single crystals under oxidizing conditionsw, Phys. Chem. Chem. Phys, 7 (2005) 2053-2060. [48] R. Meyer, R. Waser, J. Helmbold, G. Borchardt, Observation of Vacancy Defect Migration in the Cation Sublattice of Complex Oxides by O18 Tracer Experiments, Physical review letters, 90 (2003) 105901. [49] K. Gömann, G. Borchardt, A. Gunhold, W. Maus-Friedrichs, H. Baumann, Ti diffusion in La-doped SrTiO3 single crystals, Physical Chemistry Chemical Physics, 6 (2004) 3639-3644. [50] S. Šturm, A. Rečnik, M. Čeh, Nucleation and growth of planar faults in SrO-excess SrTiO3, Journal of the European Ceramic Society, 21 (2001) 2141-2144. [51] L. Li, X.M. Chen, Frequency‐Dependent Qf Value of Microwave Dielectric Ceramics, Journal of the American Ceramic Society, 97 (2014) 3041-3043. [52] Z. He, M. Cao, L. Zhou, L. Zhang, J. Xie, S. Zhang, J. Qi, H. Hao, Z. Yao, Z. Yu, Origin of low dielectric loss and giant dielectric response in (Nb+ Al) co‐doped strontium titanate, Journal of the American Ceramic Society. [53] C. Wang, C. Lei, G. Wang, X. Sun, T. Li, S. Huang, H. Wang, Y. Li, Oxygen-vacancy-related dielectric relaxations in SrTiO3 at high temperatures, Journal of Applied Physics, 113 (2013) 094103. | - |
| dc.identifier.uri | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/78897 | - |
| dc.description.abstract | 為了滿足通訊科技對更高的頻寬、更多資料傳輸量的要求，微波介電材料的發展顯得日益重要。鈦酸鍶為微波介電材料的一種，一直以來受到學術界許多的關注。在本研究中，利用固態反應法配製不同鍶鈦比的鈦酸鍶，鍶鈦比範圍為0.95到1.05。當研究不同鍶鈦比鈦酸鍶的燒結行為，根據燒結動力數據結果發現，鍶鈦比小於等於一的試片在低溫下收縮較慢，然而隨著溫度升高到1250℃之後，其收縮速率超越鍶鈦比大於一的試片且在1400℃燒結後擁有較高的緻密度。在微結構上兩者也有許多差異，在鍶鈦比大於一的試片觀察到等軸晶和咖啡豆形貌晶粒同時存在，且有異常晶粒成長現象；反之，鍶鈦比小於等於一試片則只觀察到等軸晶且鍶鈦比小於一的試片可看到二氧化鈦在晶界上。結果顯示不同鍶鈦比會大幅影響鈦酸鍶的燒結行為、微結構以及二次相的多寡而介電性質則容易受到上述因素所影響。在低頻量測下，鍶鈦比小於一試樣有較高的共振品質因子；然而在微波頻段下，各組成的共振品質因子沒有明顯的差異，另外鍶鈦比小於等於一的試樣的介電常數較高且介電常數隨著鍶鈦比的增加而下降。 | zh_TW |
| dc.description.abstract | Nowadays, in order to meet the request for higher speed and larger data transmission for telecommunication, the development of the microwave dielectric ceramics is crucial.
SrTiO3 is a dielectric ceramic which has drown lots of attention for a long time. In the present study, the SrTiO3 powders with various Sr/Ti ratios were prepared using a solid state reaction. The Sr/Ti ratio varied from 0.95 to 1.05 with a step of 0.01. The sintering behavior of SrTiO3 as a function of Sr/Ti ratio was then investigated. Using TMA analysis, the Ti-rich and Sr/Ti=1.00 SrTiO3 specimens showed a lower densification rate at low temperature; however, their densification rate was higher than Sr-rich ones above 1250℃. Their density after sintering at 1400℃ was also higher. The morphology for the Sr-rich SrTiO3 showed the mixture of the equiaxed and coffee bean-like grains. On the other hand, the morphology for Ti-rich and Sr/Ti=1.00 SrTiO3 specimens exhibited equiaxed shape only. Some TiO2 second phase particles were located at the grain boundary for Ti-rich SrTiO3. Abnormal grain growth could be found in Sr-rich specimens. Some pores were trapped inside the abnormal grains. The Sr/Ti ratio strongly affected the shrinkage rate, relative density, microstructure, and the amount of second phases. As a consequence, the dielectric properties were influenced by these factors. At low frequency (1MHz), the Ti-rich SrTiO3 showed a higher quality factor. It may be related to their higher relative density and higher chemical defect concentration. Nevertheless, under microwave frequency, the quality factor of SrTiO3 specimens showed no dependence on Sr/Ti ratio. Moreover, the Ti-rich and Sr/Ti=1.00 specimens exhibited higher permittivity and the permittivity gradually decreased with increasing Sr/Ti ratio. | en |
| dc.description.provenance | Made available in DSpace on 2021-07-11T15:27:32Z (GMT). No. of bitstreams: 1 ntu-107-R05527010-1.pdf: 9748344 bytes, checksum: ab4ff7f8c301808415173c2d62ed8dfc (MD5) Previous issue date: 2018 | en |
| dc.description.tableofcontents | 口試委員會審定書 i
誌謝 iii 中文摘要 iiii ABSTRACT v CONTENTS viii LIST OF FIGURES viii LIST OF TABLES xiii Chapter 1 Introduction 1 Chapter 2 Literature survey 2 2.1 Basics for SrTiO3 2 2.2 Sintering behavior of SrTiO3 5 2.2.1 Non-Arrhenius grain growth behavior 5 2.2.2 Abnormal grain growth (AGG) 8 2.3 Nonstoichiometry SrTiO3 9 2.3.1 Second phase and microstructure observation 9 2.3.2 Sintering behavior 12 2.4 Microwave dielectric properties 14 Chapter 3 Experimental procedure 18 3.1 Processing 18 3.1.1 Raw powder 18 3.1.2 Solid state reaction 18 3.1.3 Pressing and sintering 20 3.2 Analysis 21 3.2.1 Powder size distribution 21 3.2.2 Phase identification 21 3.2.3 Relative density 21 3.2.4 Dilatometer analysis 22 3.2.5 Microstructure observation 22 3.2.6 Electron backscatter diffraction 22 3.2.7 Electron probe micro-analyzer 22 3.2.8 Vickers hardness test 23 3.2.9 Dielectric properties measurement 23 3.2.10 Microwave dielectric properties 23 3.2.11 Insulation resistance 24 Chapter 4 Results 25 4.1 Starting powders 25 4.2 Calcination and sintering behavior 26 4.2.1 Particle analysis 26 4.2.2 Phase identification 28 4.2.3 Relative density and weight loss 31 4.2.4 Sintering kinetics 33 4.2.5 Microstructure observation 36 4.2.6 Vickers hardness test 45 4.2.7 Electron probe micro-analyzer 47 4.2.8 Electron backscatter diffraction for coffee bean structure 49 4.3 Dielectric property measurement 56 4.3.1 Dielectric property at low frequency 56 4.3.2 Microwave dielectric property 61 4.3.3 Insulation resistance 62 Chapter 5 Discussion 63 5.1 Phase identification 63 5.2 Sintering behavior 65 5.3 Microstructure 69 5.4 Dielectric properties 75 5.5 Microwave dielectric properties 79 5.6 Insulation resistance 82 5.7 Future work 83 Chapter 6 Conclusions 84 References 86 | - |
| dc.language.iso | en | - |
| dc.title | 不同鍶鈦比對鈦酸鍶之燒結行為和微結構以及介電性質的影響 | zh_TW |
| dc.title | Sintering behavior, microstructure and dielectric properties of SrTiO3 with different Sr/Ti ratio | en |
| dc.type | Thesis | - |
| dc.date.schoolyear | 107-2 | - |
| dc.description.degree | 碩士 | - |
| dc.contributor.oralexamcommittee | 謝宗霖;施劭儒;周振嘉 | zh_TW |
| dc.contributor.oralexamcommittee | ;; | en |
| dc.subject.keyword | 鈦酸鍶,燒結行為,微波介電性質, | zh_TW |
| dc.subject.keyword | nonstoichiometry SrTiO3,sintering behavior,microwave dielectric properties, | en |
| dc.relation.page | 91 | - |
| dc.identifier.doi | 10.6342/NTU201802085 | - |
| dc.rights.note | 未授權 | - |
| dc.date.accepted | 2018-08-01 | - |
| dc.contributor.author-college | 工學院 | - |
| dc.contributor.author-dept | 材料科學與工程學系 | - |
| dc.date.embargo-lift | 2024-07-23 | - |
| Appears in Collections: | 材料科學與工程學系 | |
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