TITLE:
The Influence of Zn2+ Ions Substitution on the Microstructure and Transport Properties of Mn-Zn Nanoferrites
AUTHORS:
Mohamed Ali Ahmed, Kasim El-Sayed Rady, Kamel Mohamed El-Shokrofy, Ahmed Abo Arais, Mohamed Said Shams
KEYWORDS:
Mn-Zn Ferrite, XRD, Microstructure, IR, DC Resistivity, Seeback Coefficient
JOURNAL NAME:
Materials Sciences and Applications,
Vol.5 No.13,
November
28,
2014
ABSTRACT: The effect of Zn2+ ions on the microstructure and electrical properties of Mn1-xZnxFe2O4 (0.0 ≤ x ≤ 0.5 in steps of 0.1) through a solid state reaction has been
investigated. The structural properties have
been investigated using X-ray diffraction (XRD) technique. The XRD analysis
confirms that all samples are in a
single-phase cubic spinel structure. The experimental lattice parameter (aexp) was decreased with increasing Zn2+ ions substitution due to the smaller ionic radius of zinc content. The
crystallite size (t) of samples was
estimated by Scherrer’s formula and found in the range (90 - 115 nm). Dc
electrical resistivity and Seebeck voltage coefficients were measured as a function
of temperature using the two probe methods. The temperature variation of
resistivity exhibits two breaks, each break referring to a change in the
activation energy. The Curie temperature estimated from dc resistivity
measurement decreases with increasing Zn2+ ions. Seebeck
voltage coefficient measurements reveal n-type conduction for all samples.