Abstract
The effect of tetravalent Ti +4 substitution in Mg 0.95Mn 0.05Fe 2O 4 on its magnetic and electrical properties has been studied using X-ray diffraction, Mössbauer spectroscopy, isothermal dc magnetization and dielectric measurements. X-ray diffraction studies have shown the structural transformation from cubic to tetragonal with the Ti +4 substitution. The Mössbauer spectra of Mg 0.95Mn 0.05Fe 1.0Ti 1.0O 4 recorded in the temperature range 20–300 K shows the presence of the magnetic as well as quadrupole interactions. The isothermal hysteresis loop infers that the system exhibits a ferrimagnetic ordering at room temperature. The Zero-field-cooled (ZFC) and field-cooled (FC) magnetization studies support ferrimagnetic ordering of Mg 0.95Mn 0.05Fe 1.0Ti 1.0O 4 at room temperature. Signatures of ferroelectric transition have been observed in the temperature range 200–300 K from dielectric measurements. The observed magnetic and dielectric behaviour indicate that this material exhibits multiferroic behaviour.
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