以光譜學研究含水硝酸銪加熱過程中結構之變化

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题名:	以光譜學研究含水硝酸銪加熱過程中結構之變化
作者:	鍾守絜;Chung, Shou-Jie
贡献者:	化學學系
关键词:	鑭系金屬
日期:	2023-08-10
上传时间:	2024-09-19 14:47:28 (UTC+8)
出版者:	國立中央大學
摘要:	本論文利用激發、光致放光、時間解析與紅外線光譜研究五水硝酸銪 (Eu(NO3)3．5H2O)與六水硝酸銪(Eu(NO3)3．6H2O)在100°C及200°C，不同加熱時間下(3天、5天、7天及10天)之結構變化。由光譜資料與放光衰退曲線(5D0與5D1)可推知含水硝酸銪在100℃下，加熱前3天會先移除結晶水(crystalline water)，然後再移除配位水(coordination water)，並且形成多種配位數的結構。而兩種含水硝酸銪經過10天加熱後，最終會形成相似配位環境之結構。而在200℃下，會持續移除水分子並開始移除配位之硝酸，因此其放光光譜或放光衰退曲線皆產生複雜的變化，推測是加熱過程改變了配位結構及產生如硝酸氧化物(oxynitrates)或更複雜的分子。本論文將以光譜資料闡明此兩種含水硝酸鹽在加熱過程中之結構改變與化學變化。;Photoluminescence (PL), time-resolved, excitation, and infrared (IR) spectra of Eu(NO3)3 ·5H2O and Eu(NO3)3 ·6H2O were recorded at 100℃, and 200℃ after various heating time (3 days, 5 days, 7 days, 10 days). Based upon the spectra and emission decay curves (5D0 and 5D1), in these water-containing nitrates heated at 100℃, the crystalline water molecules are removed in the first 3 days of heating following by the removal of the coordination water molecules. These two water-containing nitrates will eventually form similar structures after heating for 10 days. At 200℃, in addition to the water removal, the coordinated nitrates are also removed and this results in more complicated spectra and decay curves. These changes could arise from the change of coordination environments and the formation of other species such as oxynitrates or more complex compounds. This thesis will use spectroscopic data to elucidate the structural and chemical changes of these two water-containing nitrates in the heating process.
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