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

• Mg–Gd–Mn nanoferrites are synthesized by solution combustion technique.
• High value of dc resistivity (108 Ω-cm) is obtained.
• Very low values of dielectric loss tangent at high frequencies were obtained.
• Gd3+ substitution resulted in weakening of A–B exchange interactions.

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.

SEM image for Mg0.9Mn0.1Gd0.3Fe1.7O4 nanoferrite.Figure optionsDownload as PowerPoint slide