Effect of Zn doping on structural, magnetic and dielectric properties of LaFeO3 synthesized through sol-gel auto-combustion process

We have studied the structural and dielectric properties of nano-crystalline LaFe1-xZnxO3 (0 <= x <= 0.3) pervoskite samples synthesized through sol-gel auto-combustion technique. X-ray diffraction and FTIR spectroscopy are used to confirm the single phase characteristics. Microstructural features are investigated using scanning electron microscope and compositional analysis is performed through energy dispersive spectroscopy. The average grain sizes, calculated from the Scherrer formula, lie in the range below 30 nm. The hysteresis (M-H) curves display a weak magnetic order and a shift in the hysteresis loops. Dielectric response has been discussed, in the framework of "universal dielectric response" model. The value of dielectric constant (epsilon') increases drastically on Zn doping. The dielectric loss factor (epsilon '') shows Debye like dipolar relaxation behavior. The observed peaks in loss factor (epsilon '') are attributed to the fact that a strong correlation between the conduction mechanism and the dielectric behavior exists in ferrites. (C) 2013 Elsevier Ltd. All rights reserved.