Journal
MATERIALS SCIENCE AND ENGINEERING B-ADVANCED FUNCTIONAL SOLID-STATE MATERIALS
Volume 166, Issue 1, Pages 76-82Publisher
ELSEVIER
DOI: 10.1016/j.mseb.2009.10.009
Keywords
Nanostructured materials; Chemical synthesis; Magnetization; Magnetic measurement; Transmission electron microscopy (TEM); X-ray diffraction (XRD)
Funding
- Council of Scientific Industrial Research, New Delhi
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Ni0.5Zn0.5Fe2O4 ferrite nanocrystals with average diameter in the range of 1-2 nm have been synthesized by reverse microemulsion. X-ray diffraction (XRD), transmission electron microscopy (TEM) and vibrating sample magnetometer (VSM) are used to characterize the structural, morphological and magnetic properties. X-ray analysis showed that the nanocrystals possess cubic spinel structure. The absence of hysteresis, negligible remanence and coercivity at 300 K indicate the superparamagnetic character and single domain in the nanocrystalline Ni0.5Zn0.5Fe2O4 ferrite materials. The nanocrystalline Ni0.5Zn0.5Fe2O4 ferrite were annealed at 600 degrees C. As a result of heat treatment the average particle size increases from 2 nm to 5 nm and the corresponding magnetization values have increased to 21.69 emu/g at 300 K. However, at low temperature of 100 K, the annealed samples show hysteresis loop which is the characteristic of a superparamagnetic to ferromagnetic transition. In addition, a comparative study of the magnetic properties of Ni0.5Zn0.5Fe2O4 ferrite nanocrystals obtained from reverse microemulsion has been carried out with those obtained from the general chemical co-precipitation route. (C) 2009 Elsevier B.V. All rights reserved.
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