Synthesis and Characterization of Fe-Doped CaTiO3 Polyhedra Prepared by Molten NaCl Salt

Abstract

CaTiO3 as one of the perovskite-based photocatalysts has a band gap energy of 3.5 eV (∼354 nm), thus will work at the ultraviolet light region. One of the strategies to decrease the band gap energy is doping metal. In this research, CaTiO3 was doped by Fe element as purposes to decreasing its band gap energy. Fe doped CaTiO3 with different Fe concentrations (0, 5, 10, 15, and 20%) compounds were synthesized using molten NaCl salt method. The diffractogram samples showed that the Fe-doped CaTiO3 crystal was successfully prepared. The refinement results showed that the samples have space group Pbnm a with Rp and Rwp values below 12%. The SEM images showed that the particle shape was regular polyhedra morphology, and doping Fe3+ caused the particle size to decrease and agglomerate. The UV-Vis DRS spectra showed that the Fe-dopant revealed the absorption light at visible range wavelength by meaning that Fe-dopant successfully lowered the band gap value of CTO (3.43 eV).