研究生: |
洪筱恬 |
---|---|
論文名稱: |
沸石群礦物之拉曼光譜研究 |
指導教授: |
劉德慶
黃怡禎 |
學位類別: |
碩士 Master |
系所名稱: |
地球科學系 Department of Earth Sciences |
論文出版年: | 2006 |
畢業學年度: | 94 |
語文別: | 中文 |
論文頁數: | 103 |
中文關鍵詞: | 沸石 、拉曼光譜 |
論文種類: | 學術論文 |
相關次數: | 點閱:172 下載:11 |
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沸石礦物普遍存在於火成岩的裂隙和孔洞中,在台灣東部海岸山脈即含有分佈廣泛的沸石群(陳培源,1998;陳培源等人,2004)。雖然沸石礦物在台灣東部分布廣泛,卻缺乏詳盡的礦物學研究。本研究主要在常溫常壓下,對不同系列的沸石礦物進行拉曼光譜量測,並以電子顯微分析確定其化學成分。針對沸石礦物拉曼光譜之振動模(vibration mode)進行初步比對與探討頻譜的變化,並進一步找出拉曼光譜與化學成分之關連性,繼而建立沸石礦物之拉曼光譜資料庫。
本研究共分析21件天然沸石與10件合成沸石樣本,並依據Gottardi and Galli (1985)分類法,分為五個部份進行討論:一、纖維質沸石(fibrous zeolites);二、單連結四環鏈(single 4-ring chains);三、雙連結四環鏈(doubly 4-ring chains);四、六環(6-ring);五、片沸石群(heulandite group)。分析結果顯示,相同二級構造單元(SBU)連接方式之沸石,擁有相似之拉曼光譜,再隨化學成分之不同,而有差異。拉曼譜線以範圍390~530 cm-1最明顯,為T-O-T (T=Si, Al)氧原子運動所造成,再配合低頻M-O振動模(M為陽離子,如Ca、Na、K等),以及較高頻之T-O振動模即可區分不同系列之沸石。
由於沸石礦物主要架構是由SiO4與AlO4連結而成,隨著Al取代Si對拉曼位移有一定程度的影響。纖維質沸石之拉曼光譜在~440 cm-1 、~530cm-1,會隨Al含量增加而輕微往高頻方向移動,是由於T-O-T角度變小所致。單連結四環鏈、雙連結四環鏈沸石最明顯之拉曼振動模,分別出現在400cm-1、480cm-1、490cm-1左右,會隨Al含量增加而往低頻方向移動,表示T-O-T角度變大。六環系列最明顯之拉曼振動模,分別出現在495 cm-1、480 cm-1和491 cm-1,三者與Al含量之間沒有固定的趨勢。片沸石群中,片沸石最明顯的T-O-T拉曼振動模出現在405 cm-1和482 cm-1左右;輝沸石最明顯的T-O-T拉曼振動模出現在410 cm-1和497 cm-1左右。由於Al含量的變化很小,因此對拉曼頻譜的影響並不是很顯著。
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