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研究生:尤彥傑
研究生(外文):Yan-Jie You
論文名稱:不同鍶鈦比對鈦酸鍶微結構與電性質之研究
論文名稱(外文):Investigation of Sr/Ti ratio on Microstructure and Electrical Properties of SrTiO3
指導教授:施劭儒
指導教授(外文):Shao-Ju Shih
口試委員:施劭儒
口試委員(外文):Shao-Ju Shih
口試日期:2012-07-17
學位類別:碩士
校院名稱:國立臺灣科技大學
系所名稱:材料科學與工程系
學門:工程學門
學類:材料工程學類
論文種類:學術論文
論文出版年:2012
畢業學年度:100
語文別:中文
論文頁數:106
中文關鍵詞:鈦酸鍶微結構共位晶界鍶鈦比電性
外文關鍵詞:SrTiO3microstructurecoincidence-site lattice(CSL)Sr/Ti electrical properties
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本研究主要在探討不同鍶鈦比(Sr/Ti ratio)對鈦酸鍶(SrTiO3)其微結構與電性上的差異,分別利用一階段燒結與二階段燒結的方式改變不同熱處裡條件並分析微結構改變晶界形貌的差異,進而解釋晶界工程對材料的重要性。
實驗結果顯示,一階段燒結試片可以看出不同鍶鈦比試片的基本特性:各試片的共位晶界(Σ3-Σ49)比例無明顯差異(皆約在16-17%)。其中Sr/Ti=1.00有最多的Σ3共位晶界(~4%),其他試片(Sr/Ti=0.91及1.14)約有約2%的Σ3晶界,本實驗由於不同Sr/Ti ratio影響晶界結構,而不能單獨用晶界來解釋,另外介電性質受不同鍶鈦比成分的影響而有所不同,此外二階段燒結的試片有類似的結果。
This study investigates the influences of Sr/Ti ratios for the microstructure and electrical properties in SrTiO3. The specimens were prepared by one-step and two-step sintering with various heating conditions. The microstructure including grain size distributions and grain boundary structures (coincidence-site lattice, CSL) were observed, and the microstructure data were correlated with electrical properties to reveal the importance of grain boundary engineering.

The experimental result of SrTiO3 samples with one-step sintering shows the populations (16-17%) of the CSL grain boundary (Σ3-Σ49) are similar. However, the SrTiO3 samples with Sr/Ti=1.00 have the highest Σ3 frequency (~4%) than that (~2%) of the other SrTiO3 samples (Sr/Ti=0.91 and 1.14). By combining the electrical measurements, the CSL populations cannot be correlated with and the activation energy of grain boundary conductivity because the properties of the CSL grain boundaries may change with the nonstoichiometric conditions (Sr/Ti ratios). In addition, the second phases of TiO2 and Ruddlesden-Popper caused by various Sr/Ti ratios affect the dielectric properties. For the two-step sintering, the similar experimental results were obtained.
摘要 I
Abstract II
致謝 III
目錄 V
圖目錄 VIII
表目錄 XI
第一章 前言 1
第二章 文獻回顧 3
2-1.鈦酸鍶特性 3
2-1-1.鈦酸鍶之晶體結構 3
2.1.2.平衡相圖 6
2.2鈦酸鍶的製備方式 10
2.3晶界的重要性 13
2.3.1晶界的分類 14
2.3.2共位晶界(coincident-site lattice grain boundaries) 16
2.3.3 多晶鈦酸鍶裡共位晶界的觀察 21
2.4 二階段燒結(Two-Step Sintering)對微結構控制的影響 22
2.5 EBSD(Electron Back-Scattered Diffraction)與晶界之關係 25
2.5.1 EBSD 分析技術原理 26
2.5.2 EBSD 裝置系統 28
2.5.3 應用EBSD 分析技術原理在鈦酸鍶晶的實例 29
2.6 電化學交流阻抗圖譜(EIS)介紹 30
2.6.1 電化學交流阻抗圖譜之基礎理論 31
2.6.2 電化學交流阻抗圖譜之等效電路 32
第三張 實驗方法 41
3.1實驗藥品與儀器 41
3.2實驗流程 43
3.3 試片之製備 44
3.3.1鈦酸鍶粉末之製備 44
3.3.2壓胚與燒結成型 45
3.4 粉體與塊材之特性檢測 46
3.4.1 X-Ray繞射分析 46
3.4.2電子微探儀分析 46
3.4.3掃描式電子顯微鏡(含X-Ray能量散佈分析) 47
3.4.4燒結試片密度量測 48
3.4.5燒結試片相對密度計算 49
3.4.6 EBSD晶界與晶粒取相分析 50
3.4.7介電性質測量 51
3.4.8 交流阻抗量測(AC Impedance measurement) 52
3.4.9 熱重與熱差分析(Thermo gravimetric analysis, TGA &; Differential Thermal Analysis, DTA) 53
第四章 結果與討論 54
4.1. 起始粉末性質分析 54
4.1.1 煆燒溫度之決定 54
4.1.2. SrTiO3 粉末相鑑定 58
4-2.一階段燒結SrTiO3 塊材特性分析 60
4-2.1 一階段燒結SrTiO3 塊材燒結曲線與XRD結晶相分析 60
4.2.2 一階段燒結SrTiO3 塊材微結構與晶界分析 62
4.2.3 一階段燒結SrTiO3介電性質與交流複數阻抗圖譜分析 68
4.3二階段燒結SrTiO3 塊材特性分析 75
4.3.1二階段燒結SrTiO3 密度與XRD結晶相分析 75
4.3.2 二階段燒結SrTiO3 塊材微結構與晶界分析 78
4.2.4 二階段燒結SrTiO3 介電性質與-交流複數阻抗圖譜分析 86
第五章 結論 98
第六章 參考文獻 100
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