Study of the colossal dielectric response in LaFe1−xZnxO3−δ perovskites
Physical Chemistry Laboratory of Mineral Materials and their Applications, National Center of Research in Material Sciences Technopole Borj Cedria, B.P. 73, 8027, Soliman, Tunisia
Accepted: 19 July 2021
Published online: 31 July 2021
The present paper investigates the impedance and dielectric properties of lead free perovskites LaFe1−xZnxO3−δ. For this purpose, we have analyzed the impact of substitution (0 ≤ x ≤ 0.15), temperature (350 to 800 °C) and frequency (5 Hz to 13 MHz) on the electric properties of the pristine LaFeO3. Impedance analyses revealed the existence of two conduction mechanisms. Furthermore, the substitution improved the dielectric properties of lanthanum ferrite. Indeed, was greatly enhanced after substitution. The colossal values would certainly encourage the use of the perovskite in nonlinear optical applications and frequency multipliers. Otherwise, low dielectric losses were obtained at high frequencies resulting in low penetration depth. This finding confers to ferrites potential applications as high frequency microwave devices. For LaFe0.85Zn0.15O3−δ, the short range movement of charge carriers dominates the relaxation process.
© The Author(s), under exclusive licence to Società Italiana di Fisica and Springer-Verlag GmbH Germany, part of Springer Nature 2021