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論文名稱 Title |
Si4+:Cr2O3之雷射剝蝕凝聚及Cr2O3-Y3Al5O12反應燒結 Laser ablation condensation of Si4+:Cr2O3 and reactive sintering of Cr2O3-Y3Al5O12 |
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系所名稱 Department |
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畢業學年期 Year, semester |
語文別 Language |
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學位類別 Degree |
頁數 Number of pages |
117 |
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研究生 Author |
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指導教授 Advisor |
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召集委員 Convenor |
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口試委員 Advisory Committee |
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口試日期 Date of Exam |
2006-06-23 |
繳交日期 Date of Submission |
2006-08-17 |
關鍵字 Keywords |
Y3Al5O12、Cr2O3、反應燒結、雷射剝蝕凝聚 Laser ablation condensation, sintering, Cr2O3-Y3Al5O12, Si4+:Cr2O3 |
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統計 Statistics |
本論文已被瀏覽 5633 次,被下載 0 次 The thesis/dissertation has been browsed 5633 times, has been downloaded 0 times. |
中文摘要 |
本文分成兩部份,第一部份利用雷射剝蝕靶材,靶材形式為鉻靶在前,矽靶在後,進行含矽氧化鉻Si4+:Cr2O3之凝聚,第二部份利用Y3Al5O12石榴子石(簡稱YAG)和Cr2O3進行反應燒結實驗,經由X-ray繞射儀、電子顯微鏡進行研究分析。 姬俊宇學長之研究發現Cr:YAG晶體光纖外層,有Cr3O4凝固偏析出現(Ji et al.,2005)。而Cr:YAG晶體光纖包裹SiO2纖衣,可因相互擴散造成尖晶石結構γ-(Cr-Al)2O3奈米顆粒,分佈於非晶質擴散層中(Lin et al.,2006)。 本文第一部份,進一步研究含鉻氧化物是否也可於晶纖拉提或包裹SiO2纖衣拉提過程中因氣態凝聚產生,結果發現在含Si環境下,可於雷射氣化靶材後,凝聚產生Si4+:α-Cr2O3及少量的Si4+:Cr3O4尖晶石結構,並且發現六角柱之Si4+:α-Cr2O3奈米顆粒傾向以基底面(0001)聚簇並產生差排,以降低界面能及應變能,最中合而為一並不形成聚簇雙晶。而側邊不完美接觸的Si4+:α-Cr2O3亦可依照顆粒之布朗運動調整方位,盡量趨近低能量的平行磊晶關係。 本文第二部分,針對Cr2O3與YAG之相互擴散及相變化,進行1600℃反應燒結實驗,結果發現因為Cr2O3與YAG相互擴散引起相變化,會形成含10 at%Cr之YAG及形成金剛石結構之α-(Cr-Al)2O3,此外,α-(Cr-Al)2O3顆粒可因布朗運動聚簇造成差排。Cr2O3-YAG擴散偶形成的鋼玉含量與成份由擴散途徑及總成份所控制。與雷射提拉Cr-YAG晶纖周圍凝固偏析之純Cr3-δO4及纖衣非晶質擴散層中所形成的尖晶石結構γ-(Cr-Al)2O3截然不同。 |
Abstract |
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目次 Table of Contents |
第一部分目錄 目錄 i 圖索引 iii 表索引 vii 一、前言 1 二、實驗步驟 6 1、酸洗靶材 6 2、雷射剝蝕 6 3、X光繞射分析 6 4、偏光顯微鏡觀察 6 5、掃瞄式電子顯微鏡(SEM)觀察 7 6、穿透式電子顯微鏡(TEM)觀察 7 三、實驗結果 9 1、X光繞射之觀察 9 2、偏光顯微鏡之觀察 9 3、掃描式電子顯微鏡(SEM)之觀察 10 4、穿透式電子顯微鏡(TEM)之觀察 10 四、討論 14 五、結論 19 六、參考文獻 20 第二部份目錄 目錄 viii 圖索引 x 表索引 xiii 一、前言 50 二、實驗步驟及方法 53 1、配粉 53 2、壓餅 53 3、熱處理 53 4、X光繞射分析 54 5、掃瞄式電子顯微鏡(SEM)觀察 54 6、穿透式電子顯微鏡(TEM)觀察 54 三、實驗結果 56 1、X-ray繞射分析 56 2、掃描式電子顯微鏡(SEM)觀察 57 2-1、莫耳比7:3(YAG:Cr2O3)1600℃反應燒結2小時 57 2-2、莫耳比7:3(YAG:Cr2O3)1600℃反應燒結6小時 57 2-3、莫耳比7:3(YAG:Cr2O3)1600℃反應燒結15小時 57 3、穿透式電子顯微鏡(SEM)之觀察 58 3-1、莫耳比7:3(YAG:Cr2O3)1600℃反應燒結2小時 58 3-2、莫耳比7:3(YAG:Cr2O3)1600℃反應燒結6小時 58 3-3、莫耳比7:3(YAG:Cr2O3)1600℃反應燒結15小時 59 3-3、莫耳比7:3(YAG:Cr2O3)1600℃反應燒結24小時 60 四、討論 61 五、結論 64 六、參考文獻 65 附錄 89 |
參考文獻 References |
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