title: Mixed alkali effect and optical properties of Ni2+ doped 20ZnO+xLi2O+(30-x)Na2O+50B2O3 glasses.
abstract: Optical and physical properties of Ni2+ doped 20ZnO+xLi2O+(30-x)Na2O+50B2O3 (5≤x≤25) glasses are carried out at room temperature. Powder XRD pattern of all the glass samples confirms the amorphous nature. Several physical parameters are evaluated for all the glasses with respect to the composition. The optical absorption spectra confirm the site symmetry of the Ni2+ doped glasses are near octahedral. Crystal field and inter-electronic repulsion parameters are also evaluated. It is interesting to observe that the optical band gap and Urbach energies exhibit the mixed alkali effect. The FT-IR spectral investigations of Ni2+ doped glasses exhibit characteristic vibrations of BO3 and BO4 units.
authors.affiliation: Department of Physics, Acharya Nagarjuna University, Nagarjuna Nagar 522 510, AP, India.
authors.forename: T Raghavendra
authors.initials: TR
authors.lastname: Rao
authors.forename: Ch Rama
authors.initials: ChR
authors.lastname: Krishna
authors.forename: Ch Venkata
authors.initials: ChV
authors.lastname: Reddy
authors.forename: U S Udayachandran
authors.initials: US
authors.lastname: Thampy
authors.forename: Y P
authors.initials: YP
authors.lastname: Reddy
authors.forename: P S
authors.initials: PS
authors.lastname: Rao
authors.forename: R V S S N
authors.initials: RV
authors.lastname: Ravikumar
mesh_terms: D000468:Alkalies / Q000737:chemistry*; D001896:Boron Compounds / Q000737:chemistry*; D005898:Glass / Q000737:chemistry*; D018020:Lithium Compounds / Q000737:chemistry*; D008962:Models, Theoretical; D009532:Nickel / Q000737:chemistry*; D010087:Oxides / Q000737:chemistry*; D017670:Sodium Compounds / Q000737:chemistry*; D017550:Spectroscopy, Fourier Transform Infrared; D015034:Zinc Oxide / Q000737:chemistry*
chemical_list: D000468:Alkalies; D001896:Boron Compounds; D018020:Lithium Compounds; D010087:Oxides; D017670:Sodium Compounds; C096707:sodium oxide; C042168:boron oxide; D009532:Nickel; D015034:Zinc Oxide