Temperature Effects on Magnetic Properties of Fe3O4 Nanoparticles Synthesized by the Sol-Gel Explosion-Assisted Method
Journal of alloys and compounds(2019)
摘要
Fe3O4 nanoparticles were successfully synthesized by the sol-gel explosion-assisted method. The phase composition of products with different ratios of dry gel and explosive agent (3:1, 6:1,12:1) was studied. Highly pure, well-crystallized, spherical and monodispersed Fe3O4 3-20 nm nanoparticles were obtained at the 12:1 ratio. X-ray photoelectron spectroscopy characterization of the as-synthesized nanoparticles demonstrated consistency with stoichiometric Fe3O4 surface composition. Zero-field cooled and field cooled measurements at 200 Oe validate that the anisotropy energy is greater than thermal energy up to 300 K for the similar to 10 nm samples. The Verwey transition (metal-insulator) of magnetite nanoparticles takes place at 128 K (T-v). The effects of different temperatures of 5 K, 128 K, and 300 K on magnetic behavior were studied in detail. The results show that hysteresis behavior weakens as the temperature increases. Saturation magnetization (M-s) of 86.2 emu/g is the highest at T-v. Initial susceptibility (chi(alpha)) increases as a function of temperature, whereas coercivity (H-c) decreases. (C) 2018 Elsevier B.V. All rights reserved.
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关键词
Sol-gel explosion-assisted,Monodispersed,Verwey transition,Magnetic behavior
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