Spectroscopic studies of lead arsenate glasses doped with nickel oxide

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 susceptibi...

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Bibliographic Details
Published in:Journal of non-crystalline solids 2011-02, Vol.357 (3), p.1130-1135
Main Authors: Rao, G. Srinivasa, Sudhakar, B.K., Prasanna, H.N.L., Devasahayam, V., Rao, M.V.S. Chandra Sekhara
Format: Article
Language:English
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
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Summary: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.
ISSN:0022-3093
1873-4812
DOI:10.1016/j.jnoncrysol.2010.11.029