Structural and spectral features of Cr3+ doped β-BaB2O4 nanopowder by co-precipitation method

Cr3+ doped β-BaB2O4 nanopowder has been prepared by using co-precipitation method and their spectral properties are studied by various spectroscopic techniques like Powder XRD, EPR, Optical, FT-IR and Photo Luminescence. Powder X-ray diffraction data reveals that the crystal structure belongs to monoclinic and the average crystallite size is evaluated. SEM images showed the surface morphology. Crystal field (Dq), and inter electronic repulsion (B&C) parameters are evaluated from the optical absorption data. From EPR and optical absorption investigations the site symmetry of Cr3+ ion in the prepared sample is ascribed to a distorted octahedron. The CIE chromaticity coordinates are calculated from the emission spectrum as x=0.179 and y=0.174. FT-IR spectrum shows the characteristic vibrational bands related to β-BaB2O4.