Structural Investigations on Sodium–Lead Borophosphate Glasses Doped with Vanadyl Ions

Electron paramagnetic resonance (EPR), optical absorption, and FT-IR spectra of vanadyl ions in the sodium–lead borophosphate (Na2O–PbO–B2O3–P2O5) (SLBP) glass system have been studied. EPR spectra of all the glass samples exhibit resonance signals characteristic of VO2+ ions. The spin Hamiltonian p...

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Bibliographic Details
Published in:The journal of physical chemistry. A, Molecules, spectroscopy, kinetics, environment, & general theory Molecules, spectroscopy, kinetics, environment, & general theory, 2012-04, Vol.116 (14), p.3547-3555
Main Authors: Srinivasulu, K, Omkaram, I, Obeid, H, Suresh Kumar, A, Rao, J. L
Format: Article
Language:English
Subjects:
Absorption spectra
Biocompatible Materials - chemistry
Boron Compounds - chemistry
Compressing
Constants
Electron Spin Resonance Spectroscopy
Energy gap
Glass
Ions
Lead - chemistry
Mathematical analysis
Optical Devices
Oxides - chemistry
Phosphorus Compounds - chemistry
Sodium Compounds - chemistry
Spectra
Spectroscopy, Fourier Transform Infrared
Temperature
Thermodynamics
Vanadates - chemistry
Vanadyl ions
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Summary:Electron paramagnetic resonance (EPR), optical absorption, and FT-IR spectra of vanadyl ions in the sodium–lead borophosphate (Na2O–PbO–B2O3–P2O5) (SLBP) glass system have been studied. EPR spectra of all the glass samples exhibit resonance signals characteristic of VO2+ ions. The spin Hamiltonian parameters g and A are found to be independent of the V2O5 content and temperature. The values of the spin Hamiltonian parameters indicate that the VO2+ ions in SLBP glasses are present in octahedral sites with tetragonal compression. The population difference between Zeeman levels (N) is calculated as a function of temperature for an SLBP glass sample containing 1.0 mol % VO2+ ions. From the EPR data, the paramagnetic susceptibility (χ) is calculated at different temperatures, and the Curie constant (C) is calculated from the 1/χ versus T graph. The optical absorption spectra of the glass samples show two absorption bands, and they are attributed to V3+ and V4+ ions. The optical band gap energy (E opt) and Urbach energy (ΔE) are calculated from their ultraviolet absorption edges. It is observed that, as the vanadium ion concentration increases, E opt decreases and ΔE increases. The study of the IR absorption spectrum depicts the presence of BO3, BO4, PO3, PO4, and VO5 structural units.
ISSN:1089-5639
1520-5215
DOI:10.1021/jp210398k