ZnFe2O4 Nanotubes: Microstructure and Magnetic Properties

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• 作者：Xuan Guo ; Haojun Zhu ; Mingsu Si ; Changjun Jiang ; Desheng Xue ; Zhihua Zhang ; Quan Li
• 刊名：Journal of Physical Chemistry C
• 出版年：2014
• 出版时间：December 26, 2014
• 年：2014
• 卷：118
• 期：51
• 页码：30145-30152
• 全文大小：530K
• ISSN：1932-7455

文摘

Employing an electron energy-loss spectrum (EELS), we have found that the structure of ZnFe₂O₄ nanotubes deviated from the normal spinel structure as the calcination temperature decreases. More Fe³⁺ ions migrate to the tetrahedral sites (A sites) rather than staying in their equilibrium octahedral sites (B sites). This results in the enhanced superexchange interactions between Fe³⁺ ions, thus affecting the magnetic properties of the nanotubes, i.e., higher blocking temperature (T_B) and larger saturation magnetization (M_S), etc. On the other hand, we have also found that deviation of the Fe/Zn from 2 affects the magnetic properties of the nanotube samples. This should be caused by the enhanced superexchange interactions resulting from the extra Fe³⁺ ions in the nonstoichiometric sample.