普魯士藍Rb-Co-Fe@K-Ni-Cr 奈米核殼結構的磁性探討

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题名:	普魯士藍Rb-Co-Fe@K-Ni-Cr 奈米核殼結構的磁性探討
作者:	王旻永;Wang,Min-Yung
贡献者:	物理學系
关键词:	普魯士藍;光敏磁性材料;Prussian Blue Analogue;Photosensitive material
日期:	2015-07-09
上传时间:	2015-09-23 11:33:33 (UTC+8)
出版者:	國立中央大學
摘要:	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.
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