Investigation of photocatalytic and dielectric behavior of LaFeO3 nanoparticles prepared by microwave-assisted sol-gel combustion route

摘要

LaFeO3 (LFO) nanoparticles were prepared by microwave-assisted sol-gel combustion method with an aid of glycine as fuel. The calcined LFO sample was characterized by X-ray diffraction (XRD), Fourier transform infrared spectroscopy, scanning electron microscopy (SEM), EDAX and UV-Vis absorption spectroscopy. Single-phase orthorhombic structure is confirmed by XRD, and data is well fitted using Rietveld refinement by Full-Prof suite. FTIR study displays vibrational modes related to orthoferrites perovskite LaFeO3. SEM images depict fine particles size, and stoichiometry of La, Fe and O in LFO is verified by EDAX. The photodegradation behavior of LFO was evaluated by the photocatalytic decolorization of the methylene blue under natural light as well as by UV irradiation for different time. To check the potential of LaFeO3 as dielectric, dielectric constant as a function of frequency and temperature was studied. Dielectric constant is found to decrease with increase in frequency indicates dispersive behavior in low-frequency region. Temperature versus dielectric constant plots for LFO at 100 kHz give dielectric anomaly around 450 A degrees C. This anomaly may be due to antiferromagnetic transition (T (N)) temperature of LFO. The present study depicts the potential of LFO to use as efficient photocatalyst and applicable dielectric materials.