Mössbauer, magnetic and electric studies on mixed Rb–Zn ferrites prepared by solution combustion method

Single phase nanosized spinel ferrites with general formula Rb0.5−x/2ZnxMn0.05Fe2.45−x/2O4 (x = 0 → 0.5) were prepared by solution combustion route using ethylene glycol as a capping agent. The ferrites obtained have been characterized by powder XRD and Mössbauer spectroscopy. Their magnetic and electric properties have been studied by employing Vibrating Sample Magnetometer (VSM), Curie temperature assembly and LCR meter. Mössbauer spectra display transition from ferrimagnetic to super-paramagnetic phase. The saturation magnetization (MS) initially exhibits an upward trend followed by regular decrease with increasing diamagnetic Zn content. Curie temperature also shows a downward trend with increasing Zn content. The resistivity of the doped samples decreases with temperature suggesting semiconductor behaviour of the ferrites. The dielectric constant (ɛ) and tangent loss (tan δ) measured at room temperature as a function of frequency show the expected ferrite behaviour.

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► The solution combustion method used for the preparation of ferrite results in the formation of pure, nanoferrite particles with average size of 6–8 nm.
► Mössbauer studies show transition from ferrimagnetic to super-paramagnetic phase.
► Magnetic and electric properties of ferrites are superior to one obtained from other ceramic methods which make them fit for high frequency applications.