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研究生:王婉寧
研究生(外文):Wan-NingWang
論文名稱:氧化鎂及氧化釔添加對鈦酸鋇結構與介電性質之影響
論文名稱(外文):Structure and Dielectric Properties of BaTiO3 Doped with MgO and Y2O3
指導教授:黃啟原黃啟原引用關係
指導教授(外文):Chi-Yuen Huang
學位類別:碩士
校院名稱:國立成功大學
系所名稱:資源工程學系碩博士班
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:95
中文關鍵詞:鈦酸鋇X8R殼-核結構介電常數
外文關鍵詞:barium titanateX8Rcore-shell structuredielectric constant
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  • 被引用被引用:1
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  • 下載下載:20
  • 收藏至我的研究室書目清單書目收藏:0
鈦酸鋇具有良好的介電材性質,因此在工業上廣泛應用於被動元件、熱敏電阻器、溫度感測器等多種高容電子產品。為了使製成的電子元件能符合工業規格需求 (Y5V、X8R、X9R 等),通常在鈦酸鋇中加入添加物,進行離子置換以改變介電常數變化率隨溫度改變的特性。本研究以鈦酸鋇為基礎,選擇氧化釔 (1.0 mol%, 3.0 mol%) 及氧化鎂 (0.5 mol%, 1.0 mol%) 作為添加,瞭解釔離子進入 Ba位置及鎂離子進入 Ti 位置後對於微結構、晶體結構與介電性質之影響,並以在較低溫獲得高緻密度且小晶粒之殼-核結構之陶瓷體為目的。
實驗結果顯示,單一添加氧化釔能抑制晶粒成長,少量添加會促進鈦酸鋇燒結收縮,當添加量提高為 3.0 mol% 會轉變為抑制燒結。單一添加氧化鎂則能促進鈦酸鋇燒結收縮和抑制晶粒成長,並獲得較平坦的溫度-電容曲線 (TCC)。透過晶格計算得知,鎂離子進入 Ti 位置後,單位晶格的 a 軸伸長、c 軸縮短,正方性下降。當氧化釔添加量從 1.0 mol% 增加為 3.0 mol% 時,部分的釔離子會取代 Ti 位置,或在晶界處析出形成 Y2Ti2O7 二次相,亦造成正方性下降。
在共添加系統中,0.5Mg1Y、0.5Mg3Y 和 1Mg1Y 樣品在 1150°C 持溫 3 小時,獲得相對密度 90 % 以上的燒結體,0.5Mg3Y 樣品的晶粒大小約在 0.7 μm - 1.0 μm 之間,由 TEM 圖中可證明,其燒結體具有殼-核結構,其中 0.5Mg3Y 陶瓷體之電容-溫度曲線符合工業之規格 (X8R)。

Due to the great performance of dielectric properties, barium titanate was used in great number of high-K capacitor products, such as passive devices, thermistors, and temperature sensors. To make electric device achieve the industrial specifications (Y5V, X8R, X9R, etc), we usually added additives into the barium titanate proceeding ion exchange to adjust the dielectric constant with temperature. The core-shell structure was obtained by Y2O3 and MgO doped into BaTiO3-based material. In this study, we investigated the microstructure, crystal structure and dielectric properties.
Doping Y2O3 can suppress grain growth of BaTiO3 bulk. The addition of 1.0 mol% Y2O3 into BaTiO3 can promote its sintering shrinkage. However, the sintering shrinkage was suppressed when amount of Y2O3 is 3.0 mol%. Doping MgO can enhance sintering shrinkage and suppress grain growth of BaTiO3 bulk, and acquire a flatter TCC curve. The addition of 3.0 mol% Y2O3 can exceed the solubility of A-sites. The tetragonality decreased as the amount of Y2O3 and MgO increased.
The bulk density of 0.5Mg1Y, 0.5Mg3Y, and 1Mg1Y specimens sintered at 1150°C/3h was more than 90%, and the grain size of 0.5Mg3Y was between 0.7 μm - 1.0 μm. The TCC curve of 0.5Mg3Y bulk when sintered at 1150°C/3h could achieve X8R specification.

摘要 I
Abstract II
致謝 III
目錄 IV
表目錄 VI
圖目錄 VII
第一章 緒論 1
1-1 前言 1
1-2 研究目的 1
第二章前人文獻回顧及理論基礎 3
2-1 鈦酸鋇晶體結構及性質 3
2-2 添加物對鈦酸鋇性質的影響 7
2-3 燒結理論 16
2-3-1 燒結基本原理及機構 16
2-3-2 液相燒結原理 20
2-3-3 晶粒成長的抑制 22
2-4氧化物添加劑對鈦酸鋇燒結行為之影響 23
2-4-1 單一添加氧化釔對鈦酸鋇燒結行為之影響 23
2-4-2 單一添加氧化鎂對鈦酸鋇燒結行為之影響 24
2-5 氧化鎂及氧化釔共添加於鈦酸鋇系統之反應機制 25
第三章 實驗方法與實驗流程 28
3-1 起始原料 28
3-2 實驗方法與實驗流程 28
3-2-1 粉末製備 28
3-2-2 粉末之熱差/熱重分析 30
3-2-3 陶瓷體製備和燒結收縮量測 35
3-3 材料分析 35
3-3-1表面電位量測 35
3-3-2 X 光粉末繞射分析 35
3-3-3 晶格常數分析 36
3-3-4掃描式電子顯微鏡 38
3-3-5穿透式點子顯微鏡 38
3-3-6陶瓷體之密度量測 38
3-4 性質分析 39
3-4-1 陶瓷體樣品準備與介電常數量測 39
3-4-2 溫度-電容曲線量測 40
第四章 結果與討論 41
4-1 起始粉末之熱差/熱重分析 41
4-2 Ba/Ti 比之粉末分析 41
4-3 粉末之材料分析 42
4-3-1 微結構分析 42
4-3-2 晶格常數計算 42
4-4 單一添加之陶瓷體分析 54
4-4-1 燒結收縮量測 54
4-4-2 燒結體微結構與密度之演變 55
4-5 共添加之陶瓷體分析 61
4-5-1 燒結收縮量測 61
4-5-2 燒結體微結構與密度之演變 62
4-6 陶瓷體之介電常數與溫度-電容曲線分析 70
4-7 綜合討論 79
第五章 結論 90
參考文獻 91
附錄A 95
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