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- W2079017030 abstract "An Fe2O3−SiO2 composite was prepared by a gelation method that adopts tetraethoxysilane and iron(III) nitrate as starting materials. The dried gel was treated at increasing temperatures, and the samples were characterized by XRD, TEM, magnetic susceptibility measurements, and EPR and Mossbauer spectroscopies. Nanometer size (3−4 nm) X-ray-amorphous iron(III) oxide particles are observed in the samples treated at low temperature. These particles display superparamagnetic behavior in the Mossbauer spectra and susceptibility measurements, and their magnetic moments indicate antiferromagnetic clustering. The occurrence of two sites for iron ions, one in the bulk and one on the surface of nanoparticles, is suggested by EPR and Mossbauer spectroscopies. Heating of the samples to higher temperatures (T > 700 °C) gives rise to a small increase of the particle size. Simultaneously XRD and TEM exhibit the formation of γ-Fe2O3 crystalline particles, Mossbauer spectra reveal a large change in the magnetization, magne..." @default.
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- W2079017030 date "1998-01-27" @default.
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- W2079017030 title "Characterization of Iron Oxide Nanoparticles in an Fe<sub>2</sub>O<sub>3</sub>−SiO<sub>2</sub> Composite Prepared by a Sol−Gel Method" @default.
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- W2079017030 doi "https://doi.org/10.1021/cm970400u" @default.
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