title: Synthesis and spectral characterizations of trivalent ions (Cr3+, Fe3+) doped CdO nanopowders.
abstract: Trivalent transition metal ions (Cr(3+), Fe(3+)) doped CdO nanopowders via sonication in the presence of Sodium lauryl sulfate as stabilizing agent were synthesized and characterized. Powder XRD studies indicate that the obtained CdO has a cubic phase and concluded that the trivalent ions doping induced the lattice constants to change some extent. Optical absorption spectra exhibited the characteristic bands of Cr(3+) and Fe(3+) ions in octahedral site symmetry. Crystal field (Dq) and inter-electronic repulsion (B and C) parameters are evaluated for Cr(3+) doped CdO nanopowders as Dq=1540, B=619 and C=3327 cm(-1) and for Fe(3+) doped CdO nanopowders Dq=920, B=690, C=2750 cm(-1). EPR spectra of the Cr(3+) and Fe(3+) doped CdO nanopowders exhibited resonances at g=1.973 and g=2 respectively which indicate distorted octahedral site for both ions with the host. Photoluminescence spectra shows the emission bands in violet and bluish green regions for Cr(3+) doped CdO, ultraviolet and blue emissions for Fe(3+) doped CdO nanopowders. The CIE chromaticity coordinates were also evaluated from the emission spectrum. FT-IR spectra indicate the presence of various functional groups of host lattice.
authors.affiliation: Department of Physics, University College of Sciences, Acharya Nagarjuna University, Nagarjuna Nagar-522510, AP, India.
authors.forename: T
authors.initials: T
authors.lastname: Aswani
authors.affiliation: Department of Physics, University College of Sciences, Acharya Nagarjuna University, Nagarjuna Nagar-522510, AP, India.
authors.forename: B
authors.initials: B
authors.lastname: Babu
authors.affiliation: Department of Physics, University College of Sciences, Acharya Nagarjuna University, Nagarjuna Nagar-522510, AP, India.
authors.forename: V Pushpa
authors.initials: VP
authors.lastname: Manjari
authors.affiliation: Department of Physics, University College of Sciences, Acharya Nagarjuna University, Nagarjuna Nagar-522510, AP, India.
authors.forename: R Joyce
authors.initials: RJ
authors.lastname: Stella
authors.affiliation: Department of Physics, University College of Sciences, Acharya Nagarjuna University, Nagarjuna Nagar-522510, AP, India.
authors.forename: G Thirumala
authors.initials: GT
authors.lastname: Rao
authors.affiliation: Department of Physics, University College of Sciences, Acharya Nagarjuna University, Nagarjuna Nagar-522510, AP, India.
authors.forename: Ch Rama
authors.initials: ChR
authors.lastname: Krishna
authors.affiliation: Department of Physics, University College of Sciences, Acharya Nagarjuna University, Nagarjuna Nagar-522510, AP, India. Electronic address: rvssn@yahoo.co.in.
authors.forename: R V S S N
authors.initials: RV
authors.lastname: Ravikumar
mesh_terms: D000042:Absorption; D019187:Cadmium Compounds / Q000737:chemistry*; D002857:Chromium / Q000737:chemistry*; D004578:Electron Spin Resonance Spectroscopy; D007477:Ions; D007501:Iron / Q000737:chemistry*; D053758:Nanoparticles / Q000737:chemistry* / Q000648:ultrastructure; D055620:Optical Phenomena; D010087:Oxides / Q000737:chemistry*; D011208:Powders; D013050:Spectrometry, Fluorescence; D013052:Spectrometry, X-Ray Emission; D017550:Spectroscopy, Fourier Transform Infrared; D014732:Vibration; D014961:X-Ray Diffraction
chemical_list: D019187:Cadmium Compounds; D007477:Ions; D010087:Oxides; D011208:Powders; C029663:cadmium oxide; D002857:Chromium; D007501:Iron
keywords: CIE diagram; Cadmium oxide; Electron microscopy; Nanopowder; Sonication; X-ray diffraction