The modification of the structure lanthanum orthoferrites (LaFeO 3 Þ to obtain ceramic materials with enhanced structural, optical, and electrical properties constitutes an active area of research. The preparation of La 0:8 Pb 0:2 (Fe, Ti) 0:5 O 3 (LPFTO) ceramic nanoparticles by following a cation substitution approach from LaFeO 3 using sol-gel and sintering methods is described. The electrical and dielectric properties of the obtained material are investigated. The contribution of grain and grain boundary in the conduction mechanism is demonstrated by complex impedance analysis. The LPFTO ceramic nanoparticles exhibit a giant dielectric constant of the order of 10 8 . The conductivity analysis suggests the occurrence of thermally activated semiconductor behavior. Moreover, the ferromagnetic-paramagnetic semiconductor transition temperature is observed at 385 K. The ac conductivity behavior satisfies the nonoverlapping small-polaron tunneling (NSPT) model.
A series of La1-xPbxFe0.5Ti0.5O3 (x = 0.1, 0.2, and 0.3) nanoparticles have been successfully synthesized by sol-gel method. All prepared samples were characterized by X-ray diffraction (XRD), Raman scattering, Fourier Transform Infrared spectroscopy (FTIR), and UV-Vis spectrophotometry (UV-Vis). The X-ray diffraction pattern revealed the orthorhombic crystal structure and the increase of crystallite size with Pb content. The Raman scattering exhibited the similar Raman spectrum indicating the crystal structure remain unchanged due to the Pb substitution; indeed, the difference in lattice vibration phonon modes confirmed the variation in structural parameters with Pb-substitution which is also supported by FT-IR analysis. By using UV-Vis characterization, the optical band gap is found in the range of 2.1 – 2.2 eV.
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