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- W2011048056 abstract "Abstract γ-Fe 2 O 3 nanocrystallites dispersed in an amorphous silica matrix have been successfully synthesized for the first time by mechanical activation of a chemistry-derived precursor at room temperature. At the initial 10 h of mechanical activation, nanocrystallites of Fe 3 O 4 were triggered to form a highly activated matrix. With increasing mechanical activation time, phase transformation from Fe 3 O 4 to γ-Fe 2 O 3 occurs. γ-Fe 2 O 3 phase was well established when the precursor was mechanically activated for 30 h. Further increasing the mechanical activation time to 40 h induced the formation of α-Fe 2 O 3 . The mechanical activation-grown γ-Fe 2 O 3 nanocrystallites are ∼10–12 nm in size and they are well dispersed in the silica matrix as observed using TEM. They demonstrated superparamagnetic behavior at room temperature when measured using a vibrating sample magnetometer (VSM). In addition, the γ-Fe 2 O 3 derived from 30 h of mechanical activation exhibited a saturation magnetization of as high as 62.6 emu g −1 ." @default.
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- W2011048056 date "2002-04-01" @default.
- W2011048056 modified "2023-09-25" @default.
- W2011048056 title "Synthesis of nanocrystalline γ-Fe2O3 in silica matrix by mechanical crystallization from precursor at room temperature" @default.
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- W2011048056 doi "https://doi.org/10.1016/s0254-0584(02)00035-4" @default.
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