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Structural and magnetic properties of Cr+3 dopednano-structured γ-Fe2O3 synthesized by a modifiedsolution combustion technique

Published online by Cambridge University Press:  13 April 2011

A. Jawad  and
S.S.Z. Ashraf
A. Jawad*
Affiliation:
Department of Applied Physics, Zakir Husain College of Engineering & Technology, AMU, 202002 Aligarh, India
S.S.Z. Ashraf
Affiliation:
Department of Applied Physics, Zakir Husain College of Engineering & Technology, AMU, 202002 Aligarh, India
*
[email protected]
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Abstract

Chromium doped gamma ferrite nanopowders (16.91 nm to 25.61 nm) of the composition (Fe2- x Crx O3 for x = 0.00, 0.05, 0.06, 0.07, 0.08, 0.09, 0.10) were successfully synthesized by a modified solution combustion method using citric acid as fuel at a temperature as low as 150 °C. The so prepared samples were examined by powder XRD for phase identification and crystallite size determination. The dimensions of particle size as calculated from XRD are in good agreement with those evaluated by transmission electron microscope (TEM). Fourier Transform Infrared (FTIR) analysis was carried out to identify the various chemical bonds present in the system. Magnetic examinations were performed in terms of magnetic susceptibility and hysteresis plots. A decrease in the blocking temperature with the increase of dopant concentration was observed which is explained on the basis of Néel's relaxation theory. A simple model has been suggested to explain the behaviour of hysteresis trends as the function of dopant concentration.

Type
Research Article
Information
The European Physical Journal - Applied Physics , Volume 54 , Issue 1 , April 2011 , 10402
Copyright
© EDP Sciences, 2011

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