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Title: Nanosize dependent electrical and magnetic properties of NiFe2O4 ferrite
Authors: Singh, Sukhdeep
Ralhan, N K
Kotnala, R K
Verma, Kuldeep Chand
Keywords: Nanostructures
Chemical synthesis
Electron microscopy (TEM)
Electrical properties
Magnetic properties
Issue Date: Oct-2012
Publisher: NISCAIR-CSIR, India
Abstract: The effect of nanosize particles on dielectric and magnetic properties of NiFe2O4 (NF) ferrite has been studied. NF nanoferrites were prepared by a chemical combustion route followed by annealing temperatures from 400° to 700°C. The X-ray diffraction (XRD) shows minor amorphous behaviour of NF at 400°C. However, spinel ferrite structure has been observed with higher annealing in the temperature range 500-700°C. The average particles size is measured using Debye-Scherer’s relation. The particle's size is also measured by transmission electron microscopy and the average value is at nm scale. Room temperature dielectric properties viz.; dielectric constant (ε) and loss (tanδ) for all the specimens have been studied as a function of applied frequency in the range 100 Hz-20 MHz. These studies indicate that the values of ε and tanδ depend on the size of particles. The cole-cole plot of impedance spectroscopy has been used to find the grain size and boundary effect on electrical properties of NF nanograins. The magnetic measurements show the value of saturation magnetization (Ms) is 0.003, 44.95, 38.83, 45.26 emu/g, respectively, observed at 400°, 500°, 600° and 700°C.
Description: 739-743
ISSN: 0975-1041 (Online); 0019-5596 (Print)
Appears in Collections:IJPAP Vol.50(10) [October 2012]

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