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Novel sol–gel method for preparation of high concentration ε-Fe2O3/SiO2 nanocomposite

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ε-Fe2O3/SiO2 nanocomposite was prepared by novel solgel method using single precursor for both nanoparticles and matrix. This method allows to prepare the samples free of α-Fe2O3 with 40% of Fe2O3 in SiO2. Nanoparticles of 12 nm diameter were obtained by annealing at 1,000 °C. The samples were characterized by powder X-ray diffraction and transmission electron microscopy. Mössbauer spectroscopy identified ε-Fe2O3 as the only magnetically ordered phase at room temperature. Magnetic measurements revealed progressive necking of hysteresis loops measured at 300 and 2 K. In both cases the intrinsic coercivity reaches only 0.25 T. Measurements up to 14 T shows monotonous decreasing trend of saturated magnetization with increasing temperature.

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This work was supported by the Czech Science Foundation (Grant No. 106/07/0949). J. P. V. thanks the Ministry of Education of the Czech Republic (research plan MSM0021620834).

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Correspondence to Petr Brázda.

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Brázda, P., Nižňanský, D., Rehspringer, JL. et al. Novel sol–gel method for preparation of high concentration ε-Fe2O3/SiO2 nanocomposite. J Sol-Gel Sci Technol 51, 78–83 (2009).

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