Sm, doped Mg nano ferrites with composition Mg Sm x Fe2 − x O4 (where X = 0.000, 0.025, 0.050, 0.075,0.1) were synthesized by citrate-gel auto-combustion method. The Samples were analyzed through various experimental techniques. The structural confirmation was done with the basic characterization techniques such as XRD (X-ray Powder Diffraction) and Fourier Transform Infrared (FTIR) spectroscopic analysis. To study the optical absorption behavior of the prepared ferrites, UV-visible spectral analysis was carried out. XRD analysis established the formation of single-phase cubic spinel structure of the materials. FTIR spectra has shown two absorption peaks that are characteristic of spinel nano ferrites. The dc electrical resistivities of the Sm doped Mg nano ferrites were studied by using two probe method at the temperature range of 200–500 °C. A plot of log (σT) vs inverse of temperature yields a curve which reveals a semiconducting nature of prepared nano ferrites. The Thermo Electric Power (TEP) studies of prepared samples carried out at high temperature (573K). The values of the Seebeck coefficient and curie temperature of Sm doped Mg nano ferrites were observed. The magnetization measurements were carried out by using Vibrating Sample Magnetometer (VSM).

Rare Earth Ce3+ Substituted Nickel-Zinc Nano Ferrite were synthesized Calculated Chemical Formulation Ni0.2Zn0.8CexFe2-xO4 (0.000 ≤ x ≤ 0.040) by Citrate-Gel Auto Combustion method at lower temperature. The Single-Phase Cubic Spinel Structure was confirmed by the Characteristic of X-ray diffraction analysis (XRD). The SEM Micrographs confess from typical grain size and surface pattering of the samples is nanometric range confirming the nano crystalline nature. Energy Dispersive Spectrometer (EDS) were used to conduct elemental analysis and elemental parentage. Thermo electric power (TEP) of the prepared samples has been obtained using differential method with high temperature studies carried out in cooling cycle. The electric conductivity at high temperatures using two probe methods. The activation energy in the paramagnetic region (EP) is found greater than the ferrimagnetic region (EF). The carrier concentration(n), charge Carrier Mobility (μ) was carried out by TEP and electric conductivity Studies.

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