Structural and physical properties of CeKMoO for x = 0.0, 0.2, and 0.4 prepared by sol–gel method

The perovskite CeKMoO, where x = 0.0, 0.2, and 0.4, was prepared using sol–gel technique. Samples were characterized by X-ray diffraction (XRD), differential scanning calorimetry DSC, X-ray photoelectron spectroscopy (XPS), Raman spectroscopy, impedance spectroscopy UV–VIS, diffuse reflectance spectroscopic, and photoluminescence (PL). Besides, the XRD and Raman spectroscopy revealed an orthorhombic phase with a Pnma space group for CeKMoO samples. XPS analysis proved the existence of Mo and Mo ions. On the other hand, Raman spectroscopy has particularly shown the existence of the B mode associated to the MoO octahedron. And the DSC curves mark the absence of inflections which qualitatively shows the thermal stability of CeKMoO. Moreover, impedance spectroscopy confirmed that DC conductivity can be justified by the Arrhenius law at 475–600 K temperature range; the activation energy (≈0.314 eV) decreased with the potassium amount and by Mott’s VRH model for T < 445 K. In addition, the density’s greatest value of Fermi states, N(E) values 1.07 10 eV cm, and a low relaxation time τ≈0.5 μs were obtained with CKMO04 sample. In the end, the Tauc curves revealed that the bandgap decreased from 3.10 to 2.77 eV with K amount; the PL measurements exhibited intense emission of visible and near-infrared light under UV light excitation. In conclusion, all results found allow CeKMoO to be too useful in the field of optoelectronics.