Enhancement in dielectric and optical properties of La 1-x Ce x FeO 3 nanoparticles

摘要

La1-xCexFeO3; 0≤×≤0.15 nanoparticles were prepared in single phase using flash combustion technique. The crystalline structure and morphology of the investigated samples were researched through XRD and HRTEM. As a result, the dielectric constant of LaFeO3was enhanced by Ce3+ion substitution due to some the Ce3+ions changes its valence to Ce4+ions. The conduction mechanism in La1-xCexFeO3samples is the small polaron (SP) tunneling. The type of optical transition is direct allowed transition and the band gap values are in the range of (2.8–1.89eV). ε/values of La0.90Ce0.10FeO3decreases by increasing the external applied pressure at different frequencies.