研究生: |
陳淑慧 Chen, Shu-Hui |
---|---|
論文名稱: |
N(CH3)4CdBr3單晶的雷射拉曼光譜 The Raman Laser spectrum of the single crystal N(CH3)4CdBr3 |
指導教授: |
余健治
Yu, Jiang-Tsu |
學位類別: |
碩士 Master |
系所名稱: |
物理學系 Department of Physics |
畢業學年度: | 84 |
語文別: | 中文 |
論文頁數: | 2 |
中文關鍵詞: | 拉曼 、相變溫度 |
英文關鍵詞: | Rmamn scattering, The temperature of phase transition, N(CH3)4CdBr3, Laser Raman spectrum |
論文種類: | 學術論文 |
相關次數: | 點閱:322 下載:0 |
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1(CH3)4CdBr3(簡稱TMCB)晶體結構在室溫時是屬於六角晶,空間群P63/m,
a=0.9404nm,c=0.6990nm,Z=2;其中CdBr6是以face-shared的八面體型式沿
著c軸連成一連串無止盡的線形鍊,而N(CH3)4CdBr3則是以四面體的形式無
序的鑲在鍊與鍊之間.本實驗欲以拉曼散射的方法找出TMCB的相變溫度,我
們從室溫(300K)降至30K,量取並分析其拉曼光譜,發現TMCB有兩個相變溫
度:一個在大約180K附近,一個在大約160K附近.
The crystal structure of TMCB at room temperature is hexagonal,
space groupP63/m,a=0.9404nm,c=0.6990nm,Z=2;these compounds
contain infinite linear chainsof face-sharing CdBr6 octahedra
along the c axis,and orientationally disordered N(CH3)4
tetrahedra between the space of the chains.In this work we want
to findout the temperature of phase transition of TMCB by Raman
scattering.We cooleddown the temperature from 300K to 30K,got
and analysised the Raman spectrum ofTMCB,found out that TMCB has
two phase transition temperature:one is about 180K,one is about
160k.
The crystal structure of TMCB at room temperature is hexagonal,