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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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Published in: | Journal of magnetism and magnetic materials 2005-07, Vol.294 (3), p.294-297 |
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container_title | Journal of magnetism and magnetic materials |
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creator | Liu, Mei Li, Haibo Xiao, Li Yu, Wenxue Lu, Yang Zhao, Zhudi |
description | 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. |
doi_str_mv | 10.1016/j.jmmm.2004.12.026 |
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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. 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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. 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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.</abstract><cop>Amsterdam</cop><pub>Elsevier Science</pub><doi>10.1016/j.jmmm.2004.12.026</doi><tpages>4</tpages></addata></record> |
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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 |
title | XRD and mossbauer spectroscopy investigation of Fe2O3-Al2O3 nano-composite |
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