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研究生:潘擎宇
研究生(外文):Ching-yu Pan
論文名稱:CoO-SnO2複合陶瓷材料的缺陷微觀組織,相行為與光譜
論文名稱(外文):Defect microstructures, phase behavior and optical spectra ofCoO-SnO2 ceramic composites
指導教授:沈博彥沈博彥引用關係
指導教授(外文):Pouyan Shen
學位類別:碩士
校院名稱:國立中山大學
系所名稱:材料與光電科學學系研究所
學門:工程學門
學類:電資工程學類
論文種類:學術論文
論文出版年:2009
畢業學年度:97
語文別:中文
論文頁數:115
中文關鍵詞:穿透式電子顯微鏡尖晶石析出析出貧乏帶成核缺陷微結構
外文關鍵詞:AEMnucleationG.P.zoneprecipitate free zoneSnO2-CoO
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本文分為三個部分,第一部份是將具岩鹽結構(rock-salt type)的CoO和金紅石結構(rutile structure)的SnO2以8:92摩爾比混合後在1400℃燒結24小時,並且在900℃退火0、5及68小時,以研究固溶微量鈷的SnO2是否析出G.P.zone並且因此造成吸收光譜的改變。第二部分為改變SnO2:CoO之摩爾比為92:8、1:1、8:92,在固定燒結200小時,以用來研究長時間燒結對於樣本中化合物顆粒之形狀與周圍晶粒之間的晶向關係,及是否有析出相的發生。第三部分為固定成分為SnO2:CoO為8:92,燒結24小時,一為空冷至室溫,一為爐冷至室溫,研究其空冷及爐冷對於析出的影響。
在用電子顯微鏡觀察後發現在摩爾比例SnO2:CoO為92:8的系統中,標本燒結24小時後,爐冷至室溫,不論有無退火,在母相SnO2即有板狀Guinier-Preston (G.P.) zone的產生,且其晶癖面平行於 ,另外發現摩爾比例SnO2:CoO為92:8系統退火超過一定時間後,其子相Co2SnO4顆粒與母相SnO2接合之面,容易出現平行於SnO2晶格的{111}與{110}面。在光譜研究方面,紫外可見光光譜(UV-visible absorption spectroscopy),與純SnO2相比,在燒結24小時無論有無退火,並沒有觀察到有明顯之吸收峰,而拉曼光譜(Raman spectroscopy),試片燒結24小時,不論有無退火皆無觀察到峰值移動(shift)。而在摩爾比例SnO2:CoO為8:92的系統中,長時間燒結後,空冷至室溫,有觀察到大量次微米級具有{111}晶癖面的摻Sn4+尖晶石Co3-δO4析出物,靠摻Sn4+ CoO之空缺及晶界成核,在晶界形成析出貧乏區,爐冷則為僅在晶界析出。進一步研究顯示,摻Sn4+之CoO的點缺陷及空缺集合的形式影響尖晶石平衡相的成核與生長形狀。最後,由以上實驗與分析,得知常壓SnO2-CoO之平衡相圖應為SnO2-Co2SnO4共晶系統與CoO-Co2SnO4共晶系統組合而成。
摘要…………………………………………………………i

目錄…………………………………………………………iii

圖表目錄……………………………………………………iv

壹、前言……………………………………………………1

貳、實驗步驟及方法………………………………………5

参、實驗結果……………………………………………….8

肆、討論…………………………………………………25

伍、結論…………………………………………………30

陸、參考文獻…………………………………………….31
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