臺灣博碩士論文加值系統

本論文利用交流磁化率實驗與中子繞射實驗來探討嵌入苯胺聚合物（polyaniline）於FeOCl中的(PANI)0.16FeOCl樣品。FeOCl屬於Pmmn空間群對稱，具有層狀結構，苯胺聚合物嵌入其層與層之間。
於交流磁化率實驗中，(PANI)0.16FeOCl在20K處觀察到一轉折點，經Na＋FeOCl樣品的比較實驗，此為樣品中帶正二價電的Fe離子所致。以反鐵磁性Curie-Wiess定律擬合，得到有效磁矩μeff＝4.37μB，FeOCl與(PANI)0.16FeOCl皆具有反鐵磁性，而樣品在溫度低於100K以下開始有相轉變的發生。
經中子繞射實驗結果得TN∼75K，設定磁矩方向沿著c軸時，則計算得平均飽和磁矩〈μZ〉＝3.17μB。Fe離子磁矩於10K下的磁結構為沿a軸方向平行排列呈鐵磁性，沿b、c軸反平行排列呈反鐵磁性的層狀結構，每一層有上下兩層面，兩層面上的原子位置位移了(a+b)/2的軸距離，而樣品的磁有序特性可以用單層準（quasi）二維結構來描述。

Neutron diffraction and ac magnetic susceptibility techniques have been performed to study the magnetic properties of Fe ions in (PANI)0.16FeOCl compound, which is made by intercalating polyaniline(PANI) into FeOCl. FeOCl is a layered compound with the orthorhombic space group Pmmn. Polyaniline was located between the two neighboring layers of FeOCl.
In the FeOCl compound, the Fe ions are trivalent. Intercalate polyaniline into FeOCl induced trivalent Fe ions become divalent. Ac susceptibility measurements exhibits an anomaly at 20 K in the (PANI)0.16FeOCl. This anomaly is associated with the existing of Fe2+ ions. The measurements of ac susceptibility are well-described by using the Curie-Weiss fitting for antiferromagnetic coupling. The effective moment from Curie constant is μeff=4.37μB. The Curie-Weiss fit departure the experimental curve at 100 K. Both FeOCl and (PANI)0.16FeOCl were shown an antiferromagnetic character.
The Neel temperature is TN~75 K, and the saturated moment of free Fe ions is <μZ>=3.17μB. The spins structure is parallel along a axis, and antiparallel along b and c axes. Each layer includes above plane and below plane. The order system can be described by a quasi-3D magnetic layer structure.

第一章 簡介 1
1-1 導電高分子簡介 1
1-2 樣品製作 5
參考資料 7
第二章 交流磁化率實驗與結果分析 8
2-1 交流磁化率的實驗裝置與原理簡介 8
2-2 交流磁化率的量測實驗 11
2.2.1 交流磁場強度對交流磁化率的影響 11
2.2.2 外加直流磁場之磁化率量測實驗 17
參考資料 20
第三章 中子核繞射實驗與結構分析 21
3-1 中子的基本特性 21
3-2 高解析度中子粉末繞射儀 23
3-3 GSAS 25
3-4 FeOCl核結構分析 26
3-5 (PANI)0.16FeOCl 34
參考資料 38
第四章 中子磁繞射實驗與結構分析 39
4-1 磁繞射理論 39
4-2 三軸中子繞射實驗儀器裝置圖 42
4-3 實驗結果分析 44
4.3.1 磁結構分析 44
4.3.2 磁有序實驗 52
參考資料 54
第五章 結論 55

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