Spectroscopic studies of lead arsenate glasses doped with nickel oxide

• Published in: Journal of non-crystalline solids Vol. 357; no. 3; pp. 1130 - 1135
• Main Authors: Rao, G. Srinivasa, Sudhakar, B.K., Prasanna, H.N.L., Devasahayam, V., Rao, M.V.S. Chandra Sekhara
• Format: Journal Article
• Language: English
• Published: Oxford Elsevier B.V 01.02.2011; Elsevier
• Subjects: Arsenates; Condensed matter: electronic structure, electrical, magnetic, and optical properties; Differential thermal analysis; Exact sciences and technology; Glass; Glasses; Magnetic moment; Magnetic permeability; Nickel; Optical and magnetic properties; Optical constants: refractive index, complex dielectric constant, absorption, reflection and transmission coefficients, emissivity; Optical properties and condensed-matter spectroscopy and other interactions of matter with particles and radiation; Optical properties of bulk materials and thin films; Other luminescence and radiative recombination; Physics; Spectra; Thermoluminescence; X-rays; Glasses; Differential thermal analysis; Optical and magnetic properties; Lead oxide; Arsenates; Impurity density; Glass; Magnetic moments; Binary systems; XRD; Infrared spectra; Nickel additions; Magnetic susceptibility; Energy-level transitions; Impurity site; Absorption spectra; Thermoluminescence
• ISSN: 0022-3093; 1873-4812
• DOI: 10.1016/j.jnoncrysol.2010.11.029

Lead arsenate glasses containing different concentrations of NiO ranging from 0 to 1 mol% (in steps of 0.2 mol%) were prepared. The samples were characterized by X-ray diffraction and differential thermal analysis. A number of studies viz., optical absorption, thermoluminescence, magnetic susceptibilities and IR spectra, have been carried out on these glasses. The bands observed in the optical absorption spectra of the glasses have been analyzed using Tanabe–Sugano diagrams for d 8 ion; the analysis indicates the presence of Ni 2+ ions in both tetrahedral and octahedral positions. The increase in the concentration of NiO in the glass matrix shows a gradual transformation of nickel ions from tetrahedral positions to octahedral positions in the glass network. The thermoluminescence light output of the X-ray irradiated glasses has exhibited a glow peak at 353 K (with increasing intensity with an increase in the concentration of NiO) in addition to the conventional peak due to the recombination of electron–hole centers; this glow peak is identified due to 3T 2 → 3A 2 emission transition of octahedral Ni 2+ ions. The value of the magnetic moment evaluated from the measured magnetic susceptibility show a decreasing trend from 3.84 to 3.10 μ B with the increase in the concentration of NiO. All these studies indicate an increasing presence of octahedral (lasing) Ni 2+ ions in these glasses with the increase in the concentration of NiO. ► This paper presents the research findings of PbO-As 2O 3 glasses doped with NiO. ► The DTA indicates a decreasing trend of stability against divetrification. ► The OA spectra indicate the presence of nickel ions both in O h and T d positions. ► The magnetic moment indicates an increase of octahedral Ni 2+ ions. ► The IR studies indicate the modifying action of octahedrally positioned Ni 2+ ions.