臺灣博碩士論文加值系統

本論文研究尖晶石結構之奈米鐵釩複合物的磁性變化，此晶粒大小介於3.7 至 21.5 奈米，此樣品磁特性依晶粒大小而有所改變，可從順磁性到鐵磁性，另外，磁轉換溫度、矯頑力和磁化強度會因晶粒變小而減小，在晶粒大於7.4奈米尺度下分別由零磁場冷卻和磁場冷卻之磁滯量測下得知，並在現行的結構模型下觀察結果與討論。

We present the study of magnetic behavior of iron-vanadium spinel (FeV2O4) nanoparticles with mean crystallite sizes ranging from 3.7 to 21.5 nm. The magnetic properties of samples can go from paramagnetic to ferromagnetic depending on the sizes of FeV2O4 nanoparticles. In addition, magnetic ordering temperatures, coercivity and magnetization decrease as the crystallite size decreases. For samples with crystallite size greater than 7.4 nm, a wasp-waisted hysteresis loop and loop shift were found during the zero-field-cooled (ZFC) and field-cooled (FC) measurements, respectively. The details of the mechanism leading to the observed results are discussed based on the existing models.

中文摘要 -----------------------------------------------------------Ⅰ
英文摘要 -----------------------------------------------------------Ⅱ
目錄 --------------------------------------------------------------Ⅲ
表目錄 -------------------------------------------------------------Ⅴ
圖目錄 -------------------------------------------------------------Ⅵ
第一章 前言 -------------------------------------------------------1
第二章 基礎理論 ---------------------------------------------------2
2.1 磁性的基本理論 --------------------------------------------------2
2.1.1 磁性來源 ------------------------------------------------------2
2.1.2 磁性物質的分類 ------------------------------------------------3
2.1.3 超順磁性 ------------------------------------------------------6
2.1.4 磁異向性 ------------------------------------------------------6
2.1.5 磁滯曲線 ------------------------------------------------------8
2.2 尖晶石結構 ------------------------------------------------------9
2.2.1 尖晶石結構內陽離子的分布 ---------------------------------------14
2.3 Verwey相變 ----------------------------------------------------16
第三章 實驗方法與儀器原理 --------------------------------------------17
3.1 實驗藥品 -------------------------------------------------------17
3.2 Fe3-xVxO4 粉體製備 ---------------------------------------------18
3.3性質分析及實驗設備 -----------------------------------------------20
3.3.1熱重分析儀（TGA） ---------------------------------------------20
3.3.2 X射線粉末繞射儀（XRD） ----------------------------------------32
3.3.3 X 光繞射儀 (XRD) --------------------------------------------32
3.3.4 穿透式電子顯微鏡 (TEM) ---------------------------------------23
3.3.5 振盪樣品磁化儀(VSM) ------------------------------------------25
3.3.6 M-H 量測 ----------------------------------------------------28
3.3.7 M-T 量測 ----------------------------------------------------28
第四章 結果與討論 ---------------------------------------------------29
4.1 熱處理溫度的決定 ----------------------------------------------- 29
4.2 X射線粉末繞射分析 -----------------------------------------------30
4.3 VSM 量測分析 ---------------------------------------------------36
4.3.1 M-T量測分析 --------------------------------------------------36
4.3.1 M-H量測分析 --------------------------------------------------40
第五章 結論與未來展望 -----------------------------------------------50
5.1 結論 --------------------------------------------------------- 50
5.2 未來展望 -------------------------------------------------------50
參考文獻 -----------------------------------------------------------51

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