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研究生:陳宇勝
研究生(外文):Yu-sheng Chen
論文名稱:具室溫鐵磁性釔摻雜二氧化鈰奈米顆粒之電子特性與局部結構研究
論文名稱(外文):The Electronic and The Local Structure of Room-Temperature Ferromagnetic Nanocrystalline Y-doped CeO2
指導教授:陳詩芸
指導教授(外文):Shih-yun Chen
口試委員:陳詩芸
口試委員(外文):Shih-yun Chen
口試日期:2013-07-25
學位類別:碩士
校院名稱:國立臺灣科技大學
系所名稱:材料科學與工程系
學門:工程學門
學類:材料工程學類
論文種類:學術論文
論文出版年:2013
畢業學年度:101
語文別:中文
論文頁數:109
中文關鍵詞:二氧化鈰吸收光譜室溫鐵磁性
外文關鍵詞:CeO2XANESEXAFSRTFM
相關次數:
  • 被引用被引用:1
  • 點閱點閱:144
  • 評分評分:
  • 下載下載:0
  • 收藏至我的研究室書目清單書目收藏:1
本研究利用沉澱法製備不同Y掺雜量(0%, 3%, 5%, 7%, 9%, 11% 和15%)之CeO2奈米粉末。奈米粉末之晶相和晶粒大小以X光繞射儀 (XRD) 進行鑑定,並利用超導量子干涉磁化儀 (Superconducting Quantum Interference Device Magnetometer, SQUID) 量測室溫下的磁性。而樣品之中各元素之電子特性與局部結構,則由吸收光譜 (X-ray Absorption Spectroscopy, XAS) 和磁圓偏振二向性 (Magnetic Circular Dichroism, MCD) 以及拉曼光譜 (Raman Spectroscopy) 進行分析。結果顯示在CeO2中摻雜Y,將產生兩種不同缺陷結構:Ce3+-Vo-Y3+及Y3+-Vo-Y3+,而磁性的形成不旦與Ce3+的存在有強烈相關,氧空缺的數量及結構也被發現對磁性強弱有關鍵性的影響。最後,結合不同分析所得,在CeO2中摻雜Y的系統中,室溫鐵磁性的來源以及缺陷和磁性間的關連性可用F-center交換機制 (F-center exchange mechanism, FCE) 進行解釋。
The Y-doped CeO2 nanocrystals were successfully prepared by precipitation from cerium(III) nitrate, EG and DI water, the doping level of Y ranges from 0 to 15 at%. The crystal structure and the particle size were characterized by the x-ray diffraction (XRD). The room temperature ferromagnetism (RTFM) was revealed by superconducting quantum interference device magnetometer (SQUID). The orbital- and element-selective techniques, x-ray absorption spectroscopy (XAS) and x-ray magnetic circular dichroism (XMCD) spectroscopy were then utilized to investigate the magnetic property and electronic structure of these nanocrystals. These results suggested that two defect structure: Ce3+-Vo-Y3+ and Y3+-Vo-Y3+ were coexist on the system of Y-doped CeO2 nanocrystals. The magnetism is strongly related to the trivalent cerium and the oxygen vacancies of number and structure. Finally, the relationship to the RTFM, defect and magnetism of Y-doped CeO2 nanocrystals in present study can be described by the F-center exchange mechanism (FCE) and all analysis spectroscopy.
摘要 I
Abstract II
誌 謝 III
目 錄 IV
圖索引 VI
表索引 VIII
第一章 緒論 1
1.1 前言 1
1.2 研究背景 4
1.3 研究動機與目的 6
第二章 材料特性與研究背景 7
2.1 二氧化鈰的基本性質 7
2.1.1 物理性質及晶體結構 7
2.1.2 光學性質 7
2.1.3 化學性質 8
2.2 磁性理論 10
2.2.1 磁性的來源 11
2.2.2 磁性性質的分類 13
2.2.3 平均場理論 18
2.2.4 稀磁性半導體研究的背景 21
2.3 稀磁性半導體之鐵磁性模型 28
2.3.1 磁性的模型理論 28
2.3.2 雙交換機制 (Double exchange mechanism ; DE) 30
2.3.3 束縛極化子模型 (Bound magnetic polaron ; BMP) 32
2.3.4 超交換偶合機制 (Super-exchange Interaction) 34
第三章 實驗方法 35
3.1 二氧化鈰奈米顆粒之製備 35
3.2 二氧化鈰奈米顆粒之分析 36
3.2.1 XRD分析 36
3.2.2 SQUID分析 37
3.2.3 Raman分析 39
3.3 X光吸收光譜分析技術 40
3.3.1 XAS分析介紹 40
3.3.2 XAS分析量測方法 42
3.3.3 XAS光譜分析 47
3.4 磁圓偏振二向性分析技術 56
3.4.1 MCD介紹 56
3.4.2 MCD實驗方法 57
第四章 結果與討論 60
4.1 XRD分析 60
4.2 XANES分析 62
4.3 Raman分析 74
4.4 EXAFS分析 75
4.5 綜合討論與分析 82
4.6 磁性分析 86
第五章 結論 90
參考文獻 91
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