Core−Shell-Structured Magnetic Ternary Nanocubes

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• 作者：Lingyan Wang ; Xin Wang ; Jin Luo ; Bridgid N. Wanjala ; Chongmin Wang ; Natasha A. Chernova ; Mark H. Engelhard ; Yao Liu ; In-Tae Bae ; Chuan-Jian Zhong
• 刊名：Journal of the American Chemical Society
• 出版年：2010
• 出版时间：December 22, 2010
• 年：2010
• 卷：132
• 期：50
• 页码：17686-17689
• 全文大小：262K
• 年卷期：v.132,no.50(December 22, 2010)
• ISSN：1520-5126

文摘

We report a novel core−shell-structured ternary nanocube of MnZn ferrite synthesized by controlling the reaction temperature and composition in the absence of conventionally used reducing agents. The highly monodispersed core−shell structure consists of an Fe₃O₄ core and an MnZn Ferrite shell. The observation of a Moir pattern indicates that the core and the shell are two highly crystalline materials with slightly different lattice constants that are rotated relative to each other by a small angle. The ternary core−shell nanocubes display magnetic properties regulated by a combination of the core−shell composition and exhibit an increased coercivity and field-cooled/zero-field-cooled characteristics drastically different from those of regular MnZn ferrite nanoparticles. The ability to engineer the spatial nanostructures of ternary magnetic nanoparticles in terms of shape and composition offers atomic-level versatility in fine-tuning the nanoscale magnetic properties.