Paper Title:

Evaluation of the Morphology and Magnetic Properties of Cr3+- Doped Ni-Zn Ferrites

Periodical Materials Science Forum (Volumes 591 - 593)
Main Theme Advanced Powder Technology VI
Edited by Lucio Salgado and Francisco Ambrozio Filho
Pages 120-124
DOI 10.4028/www.scientific.net/MSF.591-593.120
Citation Valmir José da Silva et al., 2008, Materials Science Forum, 591-593, 120
Online since August, 2008
Authors Valmir José da Silva, P.T.A. Santos, Lucianna Gama, Ruth Herta Goldsmith Aliaga Kiminami, D.R. Cornejo, A. Azevedo, Ana Cristina Figueiredo de Melo Costa
Keywords Chromium, Combustion Reaction, Ni-Zn Ferrite
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Abstract

This work involved a morphological, microstructural and magnetic characterization of nanosized powders and sintered samples of Ni-Zn ferrite doped with chromium. The effect of substituting Fe3+ for Cr3+ on the final characteristics of the powders and sintered samples was investigated. The Ni-Zn ferrite powders were prepared by combustion reaction using nitrates and urea as fuel, based on the concepts of propellant chemistry. The samples were uniaxially compacted by dry pressing (385 MPa) and sintered at 1200oC/2h, using a heating rate of 5ºC/min. The Ni-Zn powders and compacted samples were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), and the measures of their magnetic properties. The results revealed the formation of the cubic crystalline phase of the inverse spinel of Ni-Zn-Cr ferrite. The average crystallite size was 21 nm and 57 nm while the saturation magnetization was 47.0 and 73.1 emu/g for the powder and the sintered sample, respectively.