Impact of manganese substitution on structural and dielectric properties of Dy_0.4Sm_0.6Fe_1−xMn_xO₃

This paper elucidates the impact of Mn doping at Fe site on the structural and dielectric properties of polycrystalline Dy_0.4Sm_0.6Fe_1-xMn_xO₃ (x = 0.0, 0.1, 0.2, and 0.3) orthoferrites synthesized through sol–gel method. Rietveld refinement of X-ray diffraction confirmed the presence of single phase in all samples with no detectable impurity. The decrease in tolerance factor and broadening of Raman vibrational modes indicates the increasing distortion in FeO₆ octahedra with Mn content. Both dielectric constant and dielectric loss increases with Mn concentration except for x = 0.3. It is noticed that as doping concentration increases, dielectric anomaly shifts toward higher temperature and dielectric loss increases substantially. Furthermore, as doping concentration increases, the range of temperature over which plateau behavior observed in dielectric loss increases, irrespective of applied frequency. Moderate doping levels exhibit high dielectric constants coupled with low dielectric loss.

This paper elucidates the impact of Mn doping at Fe site on the structural and dielectric properties of polycrystalline Dy0.4Sm0.6Fe1-xMnxO3 (x = 0.0, 0.1, 0.2, and 0.3) orthoferrites synthesized through sol–gel method. The decrease in tolerance factor and broadening of Raman vibrational modes indicates the increasing distortion in FeO₆ octahedra with Mn content.

Both dielectric constant and dielectric loss increase with Mn concentration except for x = 0.3. It is noticed that as doping concentration increases, dielectric anomaly shifts toward higher temperature and dielectric loss increases substantially.