Synthesis, vibrational and UV-visible studies of sodium cadmium orthophosphate

In this paper, NaCdPO4 orthophosphate was prepared by solid-state reaction technique at high temperature. Structural, vibrational and optical properties have been investigated. X-ray powder diffraction analysis revealed that the titled compound crystallizes in the orthorhombic system with Pmnb space group. Vibrational study by means of Raman and FTIR spectroscopies confirms the existence of the (PO4)(3-) functional group. Optical properties were recorded at room temperature using UV-visible spectroscopy in the spectral range (200-800) nm. The UV-Vis absorption bands are attributed to the charge transfer from the oxygen ligands to the central phosphate atom inside the PO(4)(3)groups. The optical absorbance was measured also to determinate the optical band gap using Kubelka-Munk function. The dispersion parameters (E-0 and E-d) of this compound were estimated using the Wemple Di-Domenico model.