Magnetic diphase nanostructure of ZnFe{sub 2}O{sub 4}/{gamma}-Fe{sub 2}O{sub 3}

Journal Article · Thu Mar 15 04:00:00 EDT 2007 · Journal of Solid State Chemistry

OSTI ID:21015744

Xiangxi, Bo ^[1]; Guangshe, Li ^[1]; Xiaoqing, Qiu ^[1]; Yanfeng, Xue ^[2]

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1. State Key Structural Chemistry Laboratory and Fujian Institute of Research on the Structure of Matter, Graduate School of Chinese Academy of Sciences, Fuzhou 350002 (China)
2. Department of Physics, Jilin University, Changchun 130023 (China)

Magnetic diphase nanostructures of ZnFe{sub 2}O{sub 4}/{gamma}-Fe{sub 2}O{sub 3} 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 ZnFe{sub 2}O{sub 4}/{gamma}-Fe{sub 2}O{sub 3} was formed, in which the presence of ZnFe{sub 2}O{sub 4} enhanced the thermal stability of {gamma}-Fe{sub 2}O{sub 3}. Further increasing the initial molar ratio of Fe/Zn larger than 6 destabilized the diphase nanostructure and yielded traces of secondary phase {alpha}-Fe{sub 2}O{sub 3}. 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 {gamma}-Fe{sub 2}O{sub 3} content. - Graphical abstract: Spherical diphase nanostructure of ZnFe{sub 2}O{sub 4}/{gamma}-Fe{sub 2}O{sub 3} was obtained by varying the initial molar ratio of Fe/Zn.

• OSTI ID: 21015744
• Journal Information: Journal of Solid State Chemistry, Journal Name: Journal of Solid State Chemistry Journal Issue: 3 Vol. 180; ISSN 0022-4596; ISSN JSSCBI
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
ABSORPTION SPECTROSCOPY
INFRARED SPECTRA
IRON OXIDES
MAGNETIZATION
NANOSTRUCTURES
RAMAN SPECTRA
SPIN GLASS STATE
SUPERPARAMAGNETISM
TEMPERATURE RANGE 0273-0400 K
THERMAL GRAVIMETRIC ANALYSIS
X-RAY DIFFRACTION
ZINC COMPOUNDS