Kumar, Sanjeev and Singh, Vaishali and Aggarwal, Saroj and Mandal, Uttam Kumar and Kotnala, R. K. (2009) Synthesis of nanocrystalline Ni0.5Zn0.5Fe2O4 ferrite and study of its magnetic behavior at different temperatures. Materials Science and Engineering: B , 166 (1). pp. 76-82. ISSN 0921-5107

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Abstract

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 °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.

Item Type:	Article
Additional Information:	Copyright for this article belongs to M/s Elsevier B.V.
Uncontrolled Keywords:	A. Nanostructured materials; B. Chemical synthesis; C. Magnetization; D. Magnetic measurement; Transmission electron microscopy (TEM); X-ray diffraction (XRD)
Subjects:	Materials Science Physics
Divisions:	UNSPECIFIED
Depositing User:	Ms Neetu Chandra
Date Deposited:	20 Jul 2012 06:53
Last Modified:	20 Jul 2012 06:53
URI:	http://npl.csircentral.net/id/eprint/363

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