本實驗觀察Co1-xO顆粒在CaO基材中，是否因熱驅動達成晶向關係，以及兩者因相互擴散
引起之缺陷集合（defect clusters），以及此複合材料之微觀組織之演化。CoO/CaO系統以1
：9莫耳比例配製，在1300oC（T/Tm=0.96）熱處理5-80小時後分別作爐冷及空冷，並以穿
透式電子顯微鏡觀察微觀組織及晶向關係。結果發現，在5小時恆溫熱處理後有小於0.2μ
m的CoO顆粒與基材達成磊晶關係，在80小時長時間熱處理之後，大於0.7μm的CoO顆粒
仍無發現磊晶關係的存在，但有小於0.5μm的次微米顆粒調成平行磊晶關係：
〔111〕CaO//〔111〕CoO，〔110〕CaO//〔110〕CoO，也有以｛111｝接觸面旋轉30o的
晶向關係：〔111〕CaO//〔111〕CoO，〔112〕CaO//〔011〕CoO，此現象可以CoO顆粒的
轉動及布朗運動的描述，且動力學因素在本系統T/Tm=0.96偏高的情況下，仍不可輕忽。
另一方面，氧化鈷和氧化鈣互溶時會由於體積補償及電荷補償效應造成缺陷，並在內部
造成缺陷聚集的paracrystalline分佈。氧化鈷本身形成paracrystal然後變成尖晶石的過程相當
快，使得paracrystal無法在氧化鈷中被觀察到。而在CaO晶粒內發現許多長條狀具paracrysta
的析出物，其方向垂直晶界，我們推測可能是由於paracrystal在晶界處成核，並藉胞狀析出
（Cellular Precipitation）的作用隨晶界移動而產生。此外，由於爐冷及空冷的試片中皆可發
現此長條狀析出物，因此paracrystal的產生主要應是在退火溫度1300oC時完成，少部分則可
於退火或爐冷時在差排處成核及生長。

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誌謝 i
論文摘要 ii
目錄 iii
圖表目錄 iv
前言 1
實驗步驟與方法 3
實驗結果 4
討論 7
結論 15
參考文獻 16

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