Precipitation of zinc ferrite nanoparticles in the Fe2O3-ZnO-SiO2 glass system


Glass materials in the ZnO-Fe2O3-SiO2 System, containing zinc ferrite nanoparticles, were prepared by the sol-gel method and characterized using X-ray diffraction (XRD), scanning electron microscopy (SEM), Mossbauer spectroscopy, AC- and DC-magnetization techniques. The gel samples, dried at 130 degrees C, were further heat treated in air at 500 and 800 degrees C. At 500 degrees C zinc ferrite and hematite nanoparticles, with an average size of approximately 24 nm, were precipitated in the brown and opaque 10ZnO-10Fe(2)O(3)-80SiO(2) and in the ruby colored transparent 5ZnO-5Fe(2)O(3)-90SiO(2) and 2.5ZnO-2.5Fe(2)O(3)-95SiO(2) gl\ass matrices. In the 5ZnO-5Fe(2)O(3)-9OSiO(2) sample the nanoparticles exhibited ferro or ferrimagnetic interactions combined with superparamagnetism with a blocking temperature of approximately 14 K. Heating at 800 degrees C seems to cause partial dissolution of the zinc ferrite and hematite particles in all the investigated compositions. Accordingly at 800 degrees C the 5ZnO-5Fe(2)O(3)-90SiO(2) glass shows a paramagnetic behavior down to 2 K. (C) 2007 Elsevier B.V. All rights reserved.



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Materials Science


Ferreira da Silva, MG; Pereira, LCJ; Waerenborgh, JC

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