研究生: |
鍾彩霞 |
---|---|
論文名稱: |
[N(C2H5)4]2ZnCl4,[N(C2H5)4]2Cu, [N(C2H5)4]2CoCl4和[N(C2H5)4]2ZnBr4Cl4單晶相變機制的研究 |
指導教授: | 余健治 |
學位類別: |
博士 Doctor |
系所名稱: |
物理學系 Department of Physics |
論文出版年: | 2002 |
畢業學年度: | 90 |
語文別: | 中文 |
論文頁數: | 95 |
中文關鍵詞: | 相變 、[N(C2H5)4]2ZnCl4等晶體 、偏振拉曼光譜 |
論文種類: | 學術論文 |
相關次數: | 點閱:291 下載:14 |
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本實驗試圖以偏振拉曼 (polarized Raman) 光譜方法研究[N(C2H5)4]2ZnCl4、[N(C2H5)4]2CuCl4、[N(C2H5)4]2CoCl4和 [N(C2H5)4]2ZnBr4四種單晶在相變前後的光譜變化,找出這四種單晶的相變機制。並且藉由電子順磁共振(EPR)的譜圖研究,找出和[N(C2H5)4]2ZnCl4晶體相變有關的機制。經實驗結果,發現[N(C2H5)4]2ZnCl4、[N(C2H5)4]2CoCl4和[N(C2H5)4]2ZnBr4三種晶體的相變與陰、陽離子的無序性有關,且相變溫度隨陰離子的活化能的減小而降低,屬有序-無序相變;而[(NC2H5)4]CuCl4晶體的相變為振動外模軟化所致,為二階或一階相變。
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