Structural, electrical transport, and magnetic properties of Ni1-xZnxFe2O4

• Published in: Journal of magnetism and magnetic materials Vol. 312; no. 1; pp. 210 - 219
• Main Authors: HOSSAIN, A. K. M. Akther, MAHMUD, S. T, SEKI, M, KAWAI, T, TABATA, H
• Format: Journal Article
• Language: English
• Published: Amsterdam Elsevier Science 01-05-2007
• Subjects: Condensed matter: electronic structure, electrical, magnetic, and optical properties; Conductivity phenomena in semiconductors and insulators; Domain effects, magnetization curves, and hysteresis; Electronic transport in condensed matter; Exact sciences and technology; Low-field transport and mobility; piezoresistance; Magnetic properties and materials; Magnetization curves, magnetization reversal, hysteresis, barkhausen and related effects; Physics; Nickel oxides; Electrical conductivity; Curie point; Semiconductor materials; Magnetization; 75.50.Gg; Density; Ferrites; Zinc oxides; II-VI semiconductors; Magnetic permeability; Sintering; Transport processes; Iron oxides; Microstructure; Activation energy; Saturation magnetization; Grain size; Curie temperature; Resistivity; Saturation magnetization; Magnetic properties
• ISSN: 0304-8853
• DOI: 10.1016/j.jmmm.2006.09.030

Structural, electrical, and magnetic properties of Ni1-xZnxFe2O4 (x=0.,0.4) samples sintered at various temperatures have been investigated thoroughly. The bulk density of the Ni0.8Zn0.2Fe2O4 samples increases as the sintering temperature (Ts) increases from 1200 to 1300 deg C and above 1300 deg C the bulk density decreases slightly. The Ni0.6Zn0.4Fe2O4 samples show similar behavior of changes to that of Ni0.8Zn0.2Fe2O4 samples, except that the bulk density is found to be the highest at 1350 deg C. The DC electrical resistivity, rho(T), decreases as the temperature increases indicating that the samples have semiconductor-like behavior. As the Zn content increases, the Curie temperature (Tc), resistivity, and the activation energy decrease while the magnetization, initial permeability, and the relative quality factor (Q) increases. A Hopkinson peak is obtained near Tc in the real part of the initial permeability vs. temperature curves. The ferrite with higher permeability has a relatively lower resonance frequency. The initial permeability and magnetization of the samples has been found to correlate with density, average grain sizes. Possible explanation for the observed structural, magnetic, and changes of resistivity behavior with various Zn content are discussed.