Ravinder Dachepalli
Osmania University, India
Title: Influence on the dielectric properties of citrate-gel prepared Lithium Nano Ferrites by Aluminum substitution
Biography
Biography: Ravinder Dachepalli
Abstract
Single phase soft ferrite nano crystallites could be synthesized by different methods. We have tried to synthesize Al doped lithium nano ferrites with a chemical formula Li0.5AlxFe2.5-xO4 (where x=0.0, 0.2, 0.4, 0.6, 0.8 and 1.0) using citrate-gel auto combustion technique at low temperature (180oC) to improve their properties. It is a unique combination of the combustion and the chemical gelation processes. They are obtained as dried gel after the successful chemical reaction of these compositions of respective metal nitrate solutions in the midst of citric acid as catalyst. X-ray diffraction (XRD) analysis reveals that all the samples posses a single phase cubic spinel structure. The dielectric parameters such as dielectric constant, loss tangent, AC conductivity of the sample were studied as a function of frequency in the range of 20 Hz to 2 MHz at room temperature using Agilent E4980 Precession LCR Meter. The dielectric constant(ɛ'), loss tangent (tan δ), AC conductivity (σac) of the sample shows a normal dielectric behavior with frequency which reveals that the dispersion is due to the Maxwell-Wagner type interfacial polarization and hoping of electrons between the Fe+2 and Fe+3. On the basis of these results the explanation of dielectric mechanism in Li-Al nano ferrites is suggested.