XRD and mossbauer spectroscopy investigation of Fe2O3-Al2O3 nano-composite

Fe2O3-Al2O3 nano-composites were synthesized by sol-gel means. The properties of samples sintered at various thermal treatment temperatures were investigated by X-ray diffraction (XRD) and Mossbauer spectroscopy (MS). The experimental results show that the gamma- to alpha-Al2O3 transformation occurs...

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Bibliographic Details
Published in:Journal of magnetism and magnetic materials 2005-07, Vol.294 (3), p.294-297
Main Authors: Liu, Mei, Li, Haibo, Xiao, Li, Yu, Wenxue, Lu, Yang, Zhao, Zhudi
Format: Article
Language:English
Subjects:
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Diamagnetism, paramagnetism and superparamagnetism
Exact sciences and technology
Magnetic properties and materials
Magnetic resonances and relaxations in condensed matter, mössbauer effect
Mössbauer effect
other γ-ray spectroscopy
Physics
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Summary:Fe2O3-Al2O3 nano-composites were synthesized by sol-gel means. The properties of samples sintered at various thermal treatment temperatures were investigated by X-ray diffraction (XRD) and Mossbauer spectroscopy (MS). The experimental results show that the gamma- to alpha-Al2O3 transformation occurs at lower temperature after iron oxide doping. The samples obtained at 1173 K contained poorly crystallized gamma-Al2O3 phase and an amorphous iron oxide. When the temperature of heating was increased to 1373 K, the sample was composed of alpha-Fe2O3/alpha-Al2O3 nano-composite and some solid solution. A superparamagnetic phenomenon was observed until the thermal treatment temperature reached 1373 K.
ISSN:0304-8853
DOI:10.1016/j.jmmm.2004.12.026