臺灣博碩士論文加值系統

摘要
我們使用偏極化拉曼散射來瞭解鑭鍺鎵玻璃系統的結
構，試圖利用 peak fitting 程式來把800cm-1譜峰配適出兩個
譜峰，從譜峰位置證實玻璃結構中各種原子的運動模態
，沒有直接的證據顯示六配位的結構。比較實驗及M-B
模型的退偏振值，可以驗證此玻璃適用M-B模型，以現
存理論討論玻色子峰的生成原因，測量玻色子峰的譜峰
位置，計算出玻璃的結構相關長度，藉此瞭解玻璃中的
中程範圍有序現象。另外，使用noncoincidence 效應來討論
玻璃中的無序情形。

ABSTRACT
Polarized Raman scattering has been used to charac-terize the
structure of lanthanum gallogermanate glassessystem with the
composition xLa2O3-GeO2-yGa2O3,wherex, y=0.2,0.25,0.33,and 0.5.
We assigned the vibrational modes to different types of atomic motions
in the glassnetwork. No direct evidence of the six-fold coordinated
germanium or gallium ions in the glass structure hasbeen observed.
The nature of the low frequency Ramanpeak - the so called Boson peak
-is discussed in termsof the existing theories.We detected the low
frequencyBoson peak, and calculated from it the structural corre lation
length which measures the degree of medium range order(MRO)in
glassy materials.Otherwise, we usenoncoincidence effect to discuss the
degree of disorder in glasses.

目錄1
摘要
表索引 iii
圖索引 iv
第一章 簡介 1
第二章 理論基礎 5
2-1 拉曼散射 5
2-2 拉曼散射理論基礎 9
2-2-1 古典電磁理論 9
2-2-2 量子力學理論 13
2-3 低頻拉曼散射的理論模型 16
第三章 拉曼散射實驗 24
3-1 實驗裝置 24
3-2 氬離子雷射 27
3-3 全像式雙光柵單色儀 29
3-4 光電倍增管 33
3-5 實驗樣品 38
3-6 高溫系統及偏極板架設 41
第四章 實驗數據 43
4-1 拉曼光譜 43
4-2 偏極化拉曼光譜 46
4-3 高溫環境下的拉曼散射光譜 52
第五章 討論 59
5-1 鑭鍺鎵玻璃的基本結構 59
5-2 低頻拉曼散射與結構相關長度的關係 68
5-3 波色子峰與溫度的變化 74
第六章 結論 82
參考資料 84

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