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研究生:張啟隆
研究生(外文):Chang chi lung
論文名稱:氧化鋯添加鈮酸釔電性特性之研究
論文名稱(外文):The study of electrical properties about yttrium niobium modified zirconia
指導教授:周賢鎧
指導教授(外文):c.s.Sjou
學位類別:碩士
校院名稱:國立臺灣科技大學
系所名稱:工程技術研究所材料科技學程
學門:工程學門
學類:綜合工程學類
論文種類:學術論文
論文出版年:2001
畢業學年度:89
語文別:中文
論文頁數:88
中文關鍵詞:氧化鋯8Y-ZrO23Y-ZrO2鈮酸釔相成份電氣特性
外文關鍵詞:zirconia8Y-ZrO23Y-ZrO2YNbO4Phase structureelectrical characteristic
相關次數:
  • 被引用被引用:1
  • 點閱點閱:365
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  • 下載下載:0
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本文針對二氧化鋯( 3mol% Y2O3 及8mol% Y2O3)添加鈮酸釔(YNbO4)後對氧化鋯相結構之影響以及對其電性特性變化情形,作一研究探討。
粉末經混粉、球磨、煆燒、球磨、壓錠後,經由不同溫度之燒結處理。燒結完成之試片利用網印機印上白金電極,經由900℃燒結去除白金膠內含之有機物。利用X-Ray 繞射分析氧化鋯相成分,利用雷射粒徑分析粉末粒徑,利用SEM觀察試片表面型態與電極結構。量測氧化鋯樣品於500℃~900℃,其直流電阻值變化之情形。
由實驗結果發現,於3Y-ZrO2材料中鈮酸釔之添加確實可以增加其正方相成分比例。而此相結構改變直接影響到氧化鋯之導電特性。但於8Y-ZrO2材料中效果並不顯著,因該與氧空缺濃度被稀釋有關。由通入不同氧分壓比例及缺陷濃度方程式可以得到導電度與氧分壓之關係。
如何藉由鈮酸釔之添加,以及調整燒結熱處理條件,得到最佳之導電度,對於固態電解質之應用十分重要。氧化鋯固態電解質應用於氣體感測器、燃料電池。8Y-ZrO2 目前常用之固態電解質雖具良好之導電性,但其機械韌性不足。如何在不影響導電度下,增強氧化鋯材料機械強度,已成為近年研究課題。

This thesis investigated the variation of zirconia phase structure and electrical characteristics with YNbO4 doping concentration .
Zirconia sample were sintered at different temperatures after the process below: powder mixing, ball milling , calcining , ball milling , forming. The electrode were made by screen printing of pt paste on zirconia substrate. The zirconia phase structure were analyzed by XRD. The powder size was measured by the laser powder size analyzer. SEM was used to observed the surface and electrode structures of zirconia samples. The resistance was measured at temperatures ranged from 500℃ to 900℃.
From our experiment results , we can find that doping YNbO4 in 3Y-ZrO2 base can increase the tetragonal phase fraction which affect their conductivity directly. But it is not relevent in 8Y-ZrO2 system and could be caused by change of oxygen vacancy concentration. By introducing different oxygen partial pressures and Brouwer diagram we can get the relation between conductivity and oxygen partial pressures.
How to get the best conductivity characteristic by doping YNbO4 into zirconia base and adjusting sintering parameter are very important in solid state electrolyte field. Recently, zirconia - base solid state electrolytes have been used in gas sensors and SOFC (solid state fuel cells ). Due to its high ionic conductivity, 8Y-ZrO2 has became a famous material for those devices which need high ionic conductivity, but still need to improve the mechanical properties.
How to got a zirconia system which both have high ionic conductivity and good mechanical properties will be the task force.

第一章導論1
第二章 文獻回顧4
2.1 氧化鋯與鈮酸釔之晶體結構4
2.1-1 原子鍵結4
2.1-2 晶體結構6
2.2 氧化鋯安定劑及韌化機構8
2.2-1 氧化鋯添加之安定劑8
2.2-2二氧化鋯中韌化機制12
2.2-3鈮酸釔添加對氧化鋯結構之影響13
2-3 結構缺陷16
2-3.1 缺陷之種類16
2-3.2 電子結構18
2-3.3 缺陷濃度方程式(Brouwer Diagram)19
2.4 氧化鋯之導電性質22
2.4-1 電荷傳輸22
2-4.2 離子導電度23
2.5 應用及發展28
第三章 實驗方法及步驟30
3.1 實驗流程圖30
3.2 藥品與設備31
3.3 粉末之製備32
3-3 性質測試35
3.3-1 基本分析35
3.3-2 X-Ray繞射分析36
3.3-3 電子顯微影像觀察36
3.3-4 導電度量測37
第四章 實驗結果與分析39
4.1 粒徑與相對密度39
4.2 X-Ray 分析與電子顯微影像42
4.2-1 X-Ray 繞射結果與相成分42
4.2-2 鈮酸釔之添加與燒結溫度之影響49
4.2-3電子顯微影像觀察55
4.3 離子導電度之量測68
4.3-1 導電度量測結果68
4.3-2 鈮酸釔添加與燒結溫度變化對3Y與8Y氧化鋯導電度之影響70
4.3-3 鈮酸釔添加與燒結溫度變化對3Y與8Y氧化鋯活化能之影響80
第五章結論83

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