Magnetic diphase nanostructure of ZnFe2O4/γ-Fe2O3 |
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| Authors: | Xiangxi Bo Xiaoqing Qiu Liping Li |
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| Affiliation: | a State Key Structural Chemistry Laboratory and Fujian Institute of Research on the Structure of Matter, Graduate School of Chinese Academy of Sciences, Fuzhou 350002, P.R. China
b Department of Physics, Jilin University, Changchun 130023, P.R. China |
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| Abstract: | Magnetic diphase nanostructures of ZnFe2O4/γ-Fe2O3 were synthesized by a solvothermal method. The formation reactions were optimized by tuning the initial molar ratios of Fe/Zn. All samples were characterized by X-ray diffraction, thermogravimetric analysis, infrared spectroscopy, and Raman spectra. It is found that when the initial molar ratio of Fe/Zn is larger than 2, a diphase magnetic nanostructure of ZnFe2O4/γ-Fe2O3 was formed, in which the presence of ZnFe2O4 enhanced the thermal stability of γ-Fe2O3. Further increasing the initial molar ratio of Fe/Zn larger than 6 destabilized the diphase nanostructure and yielded traces of secondary phase α-Fe2O3. The grain surfaces of diphase nanostructure exhibited a spin-glass-like structure. At room temperature, all diphase nanostructures are superparamagnetic with saturation magnetization being increased with γ-Fe2O3 content. |
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| Keywords: | Solvothermal ZnFe2O4 γ-Fe2O3 diphase nanostructure superparamagnetic |
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