Magnetic and dielectric properties of mixed spinel Ni–Zn ferrites synthesized by citrate–nitrate combustion method

Mixed Ni x Zn 1− x Fe 2O 4 ( x = 0.1, 0.2, 0.3, 0.4 and 0.5) systems were prepared by a chemical combustion route. This method involves the addition of aqueous nickel nitrate, zinc nitrate, ferric nitrate as oxidizing agents and fuel citric acid as a reducing agent to form a homogeneous redox mixtur...

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Bibliographic Details
Published in:	Journal of alloys and compounds Vol. 491; no. 1; pp. 372 - 377
Main Authors:	Kambale, R.C., Adhate, N.R., Chougule, B.K., Kolekar, Y.D.
Format:	Journal Article
Language:	English
Published:	Kidlington Elsevier B.V 18-02-2010 Elsevier
Subjects:	Chemical synthesis Condensed matter: electronic structure, electrical, magnetic, and optical properties Cross-disciplinary physics: materials science; rheology Dielectric properties of solids and liquids Dielectric response Dielectrics, piezoelectrics, and ferroelectrics and their properties Electronic structure and electrical properties of surfaces, interfaces, thin films and low-dimensional structures Electronic transport Electronic transport in multilayers, nanoscale materials and structures Exact sciences and technology Magnetic properties and materials Magnetic properties of nanostructures Magnetically ordered materials Materials science Nanocrystalline materials Nanoscale materials and structures: fabrication and characterization Permittivity (dielectric function) Physics Dielectric response Chemical synthesis Magnetically ordered materials Electronic transport Combustion synthesis Frequency dependence Electrical conductivity Hopping conduction Ferrites spinels Temperature effects Dielectric losses Semiconductivity Chemical composition Microstructure Permittivity Nanocrystal Saturation magnetization Small polaron conduction
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Summary:	Mixed Ni x Zn 1− x Fe 2O 4 ( x = 0.1, 0.2, 0.3, 0.4 and 0.5) systems were prepared by a chemical combustion route. This method involves the addition of aqueous nickel nitrate, zinc nitrate, ferric nitrate as oxidizing agents and fuel citric acid as a reducing agent to form a homogeneous redox mixture. The product materials on calcination to 700 °C for 2 h produces nanocrystalline Ni–Zn ferrite with the corresponding average grain size ranging from 53 nm to 71 nm with varying composition. The room temperature magnetization measurements showed that the saturation magnetization ( M s ) of Zn ferrite increases with Ni content. Temperature dependent DC resistivity measurements reveal the semiconducting behavior for all the samples. Room temperature dielectric properties viz.; relative dielectric permittivity ( ɛ r ), dielectric loss (tan δ) and AC conductivity ( σ AC) for all the samples were studied as a function of applied frequency in the range from 20 Hz to 1 MHz. These studies indicate that the relative dielectric permittivity for all the samples shows usual dielectric dispersion which is due to the Maxwell–Wagner type interfacial polarization. The AC conductivity measurement suggests that the conduction is due to small polaron hopping.
Bibliography:	ObjectType-Article-2 SourceType-Scholarly Journals-1 ObjectType-Feature-1 content type line 23
ISSN:	0925-8388 1873-4669
DOI:	10.1016/j.jallcom.2009.10.187