臺灣博碩士論文加值系統

本研究採用化學析出法與異質凝團法，將0、0.1、0.2、0.3以及0.4 wt% 微量的四氧化三鈷摻雜於鎳銅鋅鐵氧磁體，並且探討其對於顯微結構與電磁性質之影響。隨著四氧化三鈷含量增加，飽和磁化與居禮溫度提高；然而初導磁率下降。利用數值擬合分析磁壁移動與自旋旋轉對於導磁率之貢獻，發現添加四氧化三鈷減少磁壁移動的磁化率，造成導磁率下降。更進一步經由理論計算，得知四氧化三鈷增加磁壁能量，使其變得較不容易移動。摻雜四氧化三鈷也改變電阻率與品質因子，其中，添加0.2 wt% 四氧化三鈷具有最大的電阻率與最佳的品質因子，此乃因為電阻率的增加可以有效減少渦電流損耗，進而提升品質因子。

目錄………………………………………….…………………………....I
圖目錄…………………………………………………………………..III
表目錄…………………………………………………………………..VI
1. 前言…………………………………………………………………...1
2. 實驗方法……………………………………………………………...3
2.1 粉體製備………………………………………………………….3
2.2 試片製備………………………………………………………….3
2.2.1 粉體造粒……………………………………………………..3
2.2.2 粉體成型……………………………………………………..4
2.2.3 脫脂與燒結…………...……………………………………...4
2.3 性質量測………………………………………………………….4
2.3.1 感應耦合電漿原子發射光譜分析…………………………..4
2.3.2 界面電位分析……………………….……………………….5
2.3.3 表面形貌觀察………………………………………………..5
2.3.4 X-ray繞射分析……...…………………….………………….5
2.3.5 相對燒結密度…………………….………………………….6
2.3.6 顯微結構觀察…………………….………………………….6
2.3.7 電性分析………………………………………………….….7
2.3.8 磁性分析……………………………………………………..7
3. 結果與討論…………………………………………….……………..8
3.1 化學析出法、表面電位以及表面形貌….…...…..……………...8
3.2 晶體與顯微結構……………………………………………….....9
3.3 電性……………………………………………………………...10
3.4 磁性…………………………………………………………...…11
4. 結論……….………………………………………………………....16
5. 參考文獻….…………………………………………………………17

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