Mössbauer spectroscopic analysis and temperature dependent electrical study of Mg0.9Mn0.1GdyFe2-yO4 nanoferrites

Abstract

Mg-Gd-Mn nanoferrites with formulae Mg0.9Mn0.1GdyFe2-yO4, where y=0.05, 0.1, 0.2 and 0.3, have been synthesized by solution combustion technique. The dc resistivity was observed to decrease with the increase in temperature. Dielectric constant (ε′) and loss tangent (tan δ) have been found to be increasing with an increase in temperature while with an increase in frequency both have been found to be decreasing. The ac electrical conductivity (σac) has been studied as a function of temperature at different frequencies and has been observed to be increasing with the increase in temperature. The Mössbauer spectroscopy has been carried out so as to authenticate our previously reported results on the super-exchange interactions.