Vanadyl ions influence on spectroscopic and dielectric properties of glass network

Babu, A. Ramesh; Rajyasree, Ch.; Rao, P. Srinivasa; Teja, P.M. Vinaya; Rao, D. Krishna

doi:10.1016/j.molstruc.2011.08.024

Cited by 26 publications

(4 citation statements)

References 35 publications

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“…At higher concentrations the weak band observed at 659 nm shows a slight blue shift in the lower wavelength region (604 nm), and this band has been attributed to the V 3+ ion and is assigned to the 3 T 1g (F) → 3 T 2g (F) transition. A similar blue shift is reported by Ramesh Babu et al for VO 2+ in lithium–strontium borate glasses. From Figure , it is also observed that the samples have a distinct cutoff wavelength.…”

Section: Discussionsupporting

confidence: 89%

“…The broad band observed at 916 nm has been attributed to the V 4+ ion, and this band is assigned to the 2 B 2g → 2 E g transition. There are a few reports in the literature , on the observation of a band for the V 4+ ion in this wavelength region, and this band position indicates that V 4+ ions are in tetragonal symmetry ( C 4 v ). At higher concentrations the weak band observed at 659 nm shows a slight blue shift in the lower wavelength region (604 nm), and this band has been attributed to the V 3+ ion and is assigned to the 3 T 1g (F) → 3 T 2g (F) transition.…”

Section: Discussionmentioning

confidence: 89%

“…For instance, in vanadium-doped phosphate glass, V 4+ is the main redox state, and spectroscopic data show the occurrence of the VO 2+ complex ion. A simple equation may then be considered: 2 V 5 + + O 2 − → 2 V 4 + + / 1 2 O 2 ↑ It is known that the undoped phosphate glass has diamagnetic properties and the vanadyl-doped phosphate is a paramagnetic material. The V 4+ ion, being paramagnetic in nature, produces a characteristic eight-line ESR spectrum.…”

Section: Discussionmentioning

confidence: 99%

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

Srinivasulu

Omkaram²,

Obeid

et al. 2012

J. Phys. Chem. A

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Electron paramagnetic resonance (EPR), optical absorption, and FT-IR spectra of vanadyl ions in the sodium-lead borophosphate (Na(2)O-PbO-B(2)O(3)-P(2)O(5)) (SLBP) glass system have been studied. EPR spectra of all the glass samples exhibit resonance signals characteristic of VO(2+) ions. The spin Hamiltonian parameters g and A are found to be independent of the V(2)O(5) content and temperature. The values of the spin Hamiltonian parameters indicate that the VO(2+) 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 % VO(2+) 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 V(3+) and V(4+) 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 BO(3), BO(4), PO(3), PO(4), and VO(5) structural units.

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Section: Discussionsupporting

confidence: 89%

Section: Discussionmentioning

confidence: 89%

Section: Discussionmentioning

confidence: 99%

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

Srinivasulu

Omkaram²,

Obeid

et al. 2012

J. Phys. Chem. A

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“…[20] The bands occured near 1600 cm ¡1 are due to the asymmetric stretching relaxation of BÀO of trigonal BO 3 units. [21] The band at 554 cm ¡1 was assigned to CeÀO stretching. [7,22] …”

Section: Ftir Analysismentioning

confidence: 99%

Transport properties of rare earth CeO₂doped phospho-vanadate glass systems

Barde

2014

Journal of the Chinese Advanced Materials Society

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The glass samples of composition 60V 2 O 5 À5P 2 O 5 À(35 ¡ x) B 2 O 3 ÀxCeO 2 , (0 x 5) containing rare earth CeO 2 were prepared by the conventional melt-quenching method. The samples were characterized by X-ray diffraction, scanning electron microscopy, Fourier transform infrared spectroscopy and thermo gravimetricÀdifferential thermal analysis (TG-DTA). The glass transition temperature and crystallization temperature were determined from the TG-DTA analysis. The activation energy for endo and exo was evaluated. The DC electrical conductivity has been carried out in the temperature range 303À473 K. The maximum conductivity and minimum activation energy were found to be 0.039 S cm ¡1 and 0.15 eV, respectively, at 473 K for x D 1. The ionic conductivity was found to be dominant over the electronic conductivity and varies between 86% and 95%. The change in density and molar volume were discussed in terms of structural modification.

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Influence of vanadium addition on the optical and photoluminescence properties of borate glasses and their glass–ceramic derivatives

Margha

Marzouk

2019

Appl. Phys. A

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Vanadyl ions influence on spectroscopic and dielectric properties of glass network

Cited by 26 publications

References 35 publications

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

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

Transport properties of rare earth CeO₂doped phospho-vanadate glass systems

Influence of vanadium addition on the optical and photoluminescence properties of borate glasses and their glass–ceramic derivatives

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Vanadyl ions influence on spectroscopic and dielectric properties of glass network

Cited by 26 publications

References 35 publications

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

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

Transport properties of rare earth CeO2doped phospho-vanadate glass systems

Influence of vanadium addition on the optical and photoluminescence properties of borate glasses and their glass–ceramic derivatives

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Product

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Transport properties of rare earth CeO₂doped phospho-vanadate glass systems