Enhancement in dielectric and optical properties of La1-xCexFeO3 nanoparticles

La1-xCexFeO3; 0 <= x <= 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 LaFeO3 was enhanced by Ce3+ ion substitution due to some the Ce3+ ions changes its valence to Ge4+ ions. The conduction mechanism in La1-xCexFeO3 samples 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 (2.8-1.89 eV). 8/ values of La0.90Ce0.10FeO3 decreases by increasing the external applied pressure at different frequencies. (C) 2019 The Authors. Published by Elsevier B.V.