The study of transition on NiFe2O4 nanoparticles prepared by co-precipitation/calcination |
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| Authors: | Jian Li Yueqiang Lin Xiaodong Liu Qingmei Zhang Hua Miao Tingzhen Zhang |
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| Institution: | 1. MOE Key Laboratory on Luminescence and Real-Time Analysis , School of Physical Science and Technology, Southwest University , Chongqing 400715, People's Republic of China aizhong@swu.edu.cn;3. MOE Key Laboratory on Luminescence and Real-Time Analysis , School of Physical Science and Technology, Southwest University , Chongqing 400715, People's Republic of China |
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| Abstract: | In this study, the NiFe2O4 nanoparticles have been prepared by co-precipitation and calcination process. Using a vibrating sample magnetometer (VSM), transmission electron microscopy (TEM), X-ray diffraction (XRD), energy dispersive spectrometer of X-ray (EDX), and X-ray photoelectron spectroscopy (XPS), the samples obtained by co-precipitation and then by further calcination have been analyzed. The experimental results show that the precursor synthesized by co-precipitation is the composite of both amorphous FeOOH and Ni(OH)2, but has no amorphous NiFe2O4. The results of both EDX and XPS revealed that the FeOOH species is wrapped up by Ni(OH)2 species. In the calcination process, the amorphous composite is dehydrated and transformed gradually into crystalline NiFe2O4 nanoparticles, with the metal ions diffusing. The reaction is different from the one used to prepare other ferrite (e.g., CoFe2O4, MnFe2O4, Fe3O4, etc.) nanoparticles directly by co-precipitation. With increasing calcination temperature, the NiFe2O4 grains grow and the magnetization is enhanced. |
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| Keywords: | NiFe2O4 nanoparticles coprecipitation reaction |
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