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系統識別號 U0026-2608201417565100
論文名稱(中文) 不同形貌奈米赤鐵礦、奈米磁鐵礦與奈米磁赤鐵礦之合成與磁特性研究
論文名稱(英文) Study on synthesis and magnetism of nano-hematite, nano-magnetite and nano-maghemite with different crystal morphologies.
校院名稱 成功大學
系所名稱(中) 地球科學系
系所名稱(英) Department of Earth Sciences
學年度 102
學期 2
出版年 103
研究生(中文) 張嘉芳
研究生(英文) Jia-Fang Zhang
學號 L46014110
學位類別 碩士
語文別 中文
論文頁數 103頁
口試委員 指導教授-陳燕華
口試委員-簡紋濱
口試委員-陳引幹
口試委員-洪崇勝
中文關鍵字 奈米赤鐵礦  奈米磁鐵礦  奈米磁赤鐵礦  奈米粒  奈米棒  奈米管  奈米環  磁特性  磁力顯微鏡 
英文關鍵字 nano-hematite  nano-magnetite  nano-maghemite  nano-particle  nano-rod  nano-tube  nano-ring  magnetic property  magnetic force microscopy 
學科別分類
中文摘要 本實驗以奈米赤鐵礦、奈米磁鐵礦和奈米磁赤鐵礦三種磁性礦物,各別以奈米粒、奈米棒、奈米管和奈米環的形態加以探討其磁性差異;觀察不同形貌的奈米磁性礦物其磁區分佈和磁區形貌,並探討其巨觀磁性行為與微觀尺度之磁性特徵是否一致?四種不同形貌的奈米赤鐵礦是以水熱合成法加以製備,奈米磁鐵礦則以碳熱還原法還原奈米赤鐵礦而成,奈米磁赤鐵礦則以鍜燒氧化奈米磁鐵礦而獲得。由穿透式電子顯微鏡(TEM)的影像得知: 赤鐵礦奈米粒的直徑約45~85 nm;赤鐵礦奈米棒的長約250~350nm,寬約50~100 nm;赤鐵礦奈米管長約150~300 nm,內徑約40~85 nm;赤鐵礦奈米環的內徑約20~45 nm,外徑約70~100 nm,而還原出的奈米磁赤鐵礦和氧化而成的奈米磁鐵礦,其粒徑大小和形貌上與奈米赤鐵礦並無差異。在超導量子干涉儀分析(SQUID)巨觀磁特性,得知奈米赤鐵礦為弱鐵磁性,奈米磁鐵礦和奈米磁赤鐵礦皆為亞鐵磁性,若以巨觀SQUID的磁化量值與微觀磁力顯微鏡(MFM)所得到之磁訊號大小相比較,則有彼此相呼應之結果。巨觀SQUID量測三種氧化鐵奈米礦物皆為擬單磁域,而微觀MFM影像可得知不同形貌之磁性礦物的整體磁矩方向、磁區分佈與磁區形狀,其大都為多磁域分佈,只有形貌為奈米粒者為單磁域結構,這表示礦物種類與礦物之形貌皆會影響其微觀磁特性。MFM技術對於磁區範圍與磁域結構能更精準量測,故MFM技術或許可應用在古地磁異常之解釋與地震斷層泥中地化環境之演化上。
英文摘要 The objective of this study is to investigate the magnetic properties of nano-hematite, nano-magnetite, and nano-maghemite with morphologies of nano-particle, nano-rod, nano-tube, and nano-ring. Four crystal morphologies of nano-hematite are synthesized by a hydrothermal method. Nano-magnetite is prepared via nano-hematite by using carbon reduction method. Nano-maghemite is obtained by oxidation of nano-magnetite. The particle-shaped nano-hematite has a granular morphology with aparticle size of 45~85 nm; the nano-rod is 50~100 nm in width and 250~350 nm in length; nano-tube has a inner-diameter of 40~85 nm width and 150~300 nm length; nano-ring shows a inner-diameter of 20~45 nm and outer-diameter of 70~100 nm. The particle size and morphology of nano-magnetite and nano-maghemite are almost the same as nano-hematite. It exhibits that all nano-hematites have a weak ferro-magnetism with multi-domains, however, all nano-magnetites and nano-maghemites are ferri-magnetic with pseudo-single-domain measured by superconducting quantum interference device magnetometer. The spatial distribution of magnetism are characterized by magnetic force microscopy (MFM). The MFM phase images show bright and dark areas, implying ferro-magnetic domains for nano-magnetite and nano-maghemite. Moreover, it reveals a complicated magnetic arrangement for nano-magnetite and nano-maghemite with crystal shapes of rod, tube and ring. Nano-magnetite and nano-maghemite with particle-shape both have a single-domain. This suggests the crystal structure and morphology have an impact on magnetic properties. The MFM technique could be applied in the explaination of paleomagnetism and environmental implications of fault zones.
論文目次 圖目錄 X
表目錄 XV
第一章緒論 1
第二章研究背景 3
2.1 物質的磁性 3
2.1.1 磁性來源 3
2.1.2 磁性分類 4
2.1.3磁域與磁滯曲線 8
2.1.4 磁性與粒徑之關係 11
2.2 材料簡介 15
2.2.1 赤鐵礦 15
2.2.2 磁鐵礦 17
2.2.3 磁赤鐵礦 18
2.3 奈米氧化鐵礦物之合成 19
2.4 奈米氧化鐵礦物合成之機制 21
2.4.1 水熱法長晶機制 21
2.4.2 碳熱還原法之機制 22
2.5 磁力顯微鏡之研究 24
第三章研究方法 29
3.1 實驗流程 29
3.1.1 實驗材料 30
3.1.2 實驗儀器 31
3.2 合成方法 32
3.2.1 奈米赤鐵礦 32
3.2.2 奈米磁鐵礦 36
3.2.3 奈米磁赤鐵礦 36
3.3 磁性礦物特性分析 37
3.3.1 X-光粉末繞射儀 37
3.3.2 穿透式電子顯微鏡 38
3.3.3 X-光光電子能譜儀 38
3.4 磁特性實驗 39
3.4.1超導量子干涉儀 39
3.4.2 磁力顯微鏡 39
第四章結果與討論 44
4.1 礦物特性分析 44
4.1.1 X-光粉末繞射分析 44
4.1.2 X-光光電子能譜儀 53
4.1.3 穿透式電子顯微鏡 56
4.2 巨觀磁性分析 60
4.3 微觀磁性分析 72
4.4 磁特性之討論 86
4.5 MFM在地科領域之展望 91
第五章結論 93
參考文獻 96
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