Abstract
Nanoscale Ni0.7-xCu0.3MgxFe2O4 (0.0 <= x <= 0.5) powders were prepared by sol-gel synthesis with M=Ni, Cu, Mg. they are obtained as dried gel after the successful reaction of their respective metal nitrates. X-ray diffraction method confirmed the successful synthesis of the materials. The average particle size of these materials has been found between 19-26 nm. Dielectric constant (epsilon') decreases with increase in frequency which is rapid at lower frequencies and slower at higher frequencies which may be due to Maxwell-Wagner interfacial polarization. Dielectric relaxation peaks were observed in the lower concentration for frequency dependence of dielectric loss tangent curves.