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研究生: 王旻永
Min-Yung Wang
論文名稱: 普魯士藍Rb-Co-Fe@K-Ni-Cr 奈米核殼結構的磁性探討
指導教授: 李文献
口試委員:
學位類別: 碩士
Master
系所名稱: 理學院 - 物理學系
Department of Physics
論文出版年: 2015
畢業學年度: 103
語文別: 中文
論文頁數: 108
中文關鍵詞: 普魯士藍光敏磁性材料
外文關鍵詞: Prussian Blue Analogue, Photosensitive material
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  • 本論文討論Rb-Co-Fe相、K-Ni-Cr相、與核殼結構的類普魯士藍(PBA)的磁性現象,Rb-Co-Fe相兩個樣品分別在7與8 K觀察到磁的相轉變,而K-Ni-Cr相有兩個磁的相轉變分別在72與68 K時產生。 核殼結構Rb-Co-Fe@ K-Ni-Cr則有三個磁相變變化分別72、68與5 K ,而核Rb-Co-Fe相的磁矩是比較弱的,而且磁矩方向是與殼K-Ni-Cr相是相反的。
    核殼結構Rb-Co-Fe@ K-Ni-Cr奈米粒子進行了中子實驗,中子散射結果顯示核殼結構Rb-Co-Fe@ K-Ni-Cr奈米粒子具有鐵磁性,Rb-Co-Fe相是光敏材料,而照光後發現K-Ni-Cr相與Rb-Co-Fe相磁性增加,我們認為Rb-Co-Fe相跟K-N-Cr相做成核殼結構的奈米粒子讓K-N-Cr相也變成光敏材料。


    In this thesis, we will discuss magnetic phenomena of Prussian Blue Analogue with Rb-Co-Fe phase, K-Ni-Cr phase and core/shell PBA heterostructure. Rb-Co-Fe phase in the two samples were 7 and 8 K magnetic phase transition was observed. Two separated magnetic phase transition at 72 and 68 K are found in K-Ni-Cr phase. Three separated magnetic phase transition at 72、68 and 5 K are found in core/shell Rb-Co-Fe@ K-Ni-Cr heterostructure. The development of weak magnetic moments in the core(Rb-Co-Fe phase). Apparently, the moments in the core and on the shell (K-Ni-Cr phase) point in the opposite directions.
    The observation of ferromagnetic of the Rb-Co-Fe@ K-Ni-Cr nanoparticle are studied through the ac magnetic susceptibility and neutron diffraction measurements, Although the CoFe material is a well established photomagnet, the magnetic of Rb-Co-Fe phase and KN-Cr phase are both increased, we believe that Rb-Co-Fe phase with KN-Cr phase formed core-shell structure nanoparticles make K-Ni-Cr phase has become photosensitive material.

    Abstract I 摘要 II 致謝 III 目錄 IV 圖目錄 VI 表目錄 XIII 第一章 簡介 1 1.1 普魯士藍簡介 1 1.2 研究目的 6 參考文獻 7 第二章 實驗儀器 8 2.1 X光繞射原理介紹 8 2.2 熱場發射掃描式電子顯微鏡(SEM) 10 2.3 磁性量測方法 12 2.4 中子散射儀器簡介 16 參考文獻: 17 第三章 Rb-Co-Fe結構與磁性探討 18 3.1樣品製備 18 3.2 樣品結構與粒徑分析 20 3.3 M(T) 26 3.4 磁化曲線擬合分析 29 3.5 交流磁化率 37 參考文獻: 43 第四章K-Ni-Cr結構與磁性探討 44 4.1 樣品製備 44 4.2 樣品結構與粒徑分析 45 4.3 M-T 49 4.4 磁化曲線和擬合分析 51 4.5 交流磁化率 55 參考文獻: 60 第五章 核殼結構Rb-Co-Fe@K-Ni-Cr結構與磁性探討 61 5.1 樣品製備 61 5.2 樣品結構與粒徑分析 62 5.3 M-T 69 5.4 磁化曲線和擬合分析 72 5.5 交流磁化率 79 5.6 中子散射 83 參考文獻: 90 第六章 結論 91

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