Role of vanadium ions on structural, optical and electrochemical properties of the vanadate-lead glasses

Rada, M.; Rus, L.; Rada, S.; Păşcuţă, Petru; Stan, Sergiu-Dan; Dura, N.; Rusu, Tiberiu; Culea, E.

doi:10.1016/j.jnoncrysol.2015.02.009

Cited by 13 publications

(4 citation statements)

References 40 publications

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“…The +5 (diamagnetic) and the +4 (paramagnetic) are the most frequent valence states of vanadium in oxide glasses [23,24]. In these glasses, the V 4+ ion appears almost exclusively as a vanadyl form, VO 2+ [25][26][27]. EPR has been successfully employed in glass research because the VO 2+ EPR spectra is easily observable until room temperature and the spin-Hamiltonian parameters, such as the g-tensor and the hyperfine coupling A-tensor are sensitive to the local environment around a paramagnetic species and the changes in the coordination geometry and ligand binding resulting from, for example, thermal treatments of glasses [28][29][30].…”

Section: Introductionmentioning

confidence: 99%

Synthesis and structural characterization of a new SbPO4-GeO2 glass system

Montesso

Manzani

Donoso

et al. 2018

Journal of Non-Crystalline Solids

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This work presents the production and characterization of a new prolific binary glass system based on SbPO 4-GeO 2. The dependence of GeO 2 content on thermal, structural and optical properties were investigated by means of thermal analysis, Raman, UV-Vis-NIR, infrared, M-lines and EPR spectroscopy. Glass transition temperatures remain constant around 410°C when GeO 2 content is increased, indicating that GeO 4 units are not responsible for increasing the connectivity of PO 4 units. Thermal stability linearly increases as a function of GeO 2 content, reaching a value around 400°C for glass containing 90 mol% of GeO 2. Raman spectroscopy was used to evaluate the glass structural changes when GeO 2 is incorporated from 30 to 90 mol% indicating a gradual change from a phosphate to a germanate glass skeleton. The optical window extends from 350 nm at UV region, up to 2.7 μm in the middle-infrared region limited by the multiphonon cutoff due to the strong OH absorption. M-lines technique shows that increasing GeO 2 content decreases the refractive index, mainly because the lower concentration of higher polarizable antimony atoms. EPR spectra of heat treated V 2 O 5 doped glasses, at different temperatures above the glass transition temperature, shows the characteristic eight-line hyperfine splitting spectrum. The spin Hamiltonian parameters obtained from the simulated spectra indicates that the paramagnetic tetravalent vanadium ions in the glasses exist as vanadyl form VO 2+ , located in axially distorted octahedral sites. For glasses treated at higher temperatures a second VO 2+ component appears in the EPR spectra and the analysis of the spin-Hamiltonian parameters suggests that these vanadyl ions are in more tetragonal distorted octahedral sites than those in the glass.

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Section: Introductionmentioning

confidence: 99%

Synthesis and structural characterization of a new SbPO4-GeO2 glass system

Montesso

Manzani

Donoso

et al. 2018

Journal of Non-Crystalline Solids

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“…The interpretation of the IR-spectra is based on the literature data of a series of crystalline and amorphous vanadate phases [29]- [34]. The Structural groups are assigned respectively, Si-O-Si bonds for bending vibration in 458-466 cm -1 [35]- [37], V-O-V bonds for chain vibration in 512-552 cm -1 [38]- [41].…”

Section: Ftir Analysis Of Silicovanadate Glassesmentioning

confidence: 99%

Morphogenesis of Silicovanadate Glasses: Investigation of Physical Properties

et al. 2021

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In this article, we demonstrate the synthesis and various characterizations of silicovanadate glasses of xSiO2 (100-x)V2O5 for x = (10-50) mol%, glasses which are prepared by the melt quenching method. FTIR spectra analysis confirms dominant chemical bonds among silicon, vanadium, and oxygen elements as expected. The assigned chemical bonds are Si-O-Si, O-Si-O, V-O-V, V=O, Si-O-V, O-H from FTIR spectra. The IR spectra of all glass specimens were baseline corrected and deconvoluted to distinct peaks of chemical bonds in overlapped Gaussians with employing computer program. The chemical bond's position shifted and affected due to the addition of vanadium pentaoxide by the heat treatment process. The X-ray diffractions (XRD) patterns of glass samples exhibit partial crystalline nature for 10S90V and 50S50V that is influenced by high-temperature application. The differential thermal analysis (DTA) of base and heat-treated specimen determines the glass transition (Tg), crystallization, and liquidus temperature with prominent exothermic and endothermic reactions. It is seen that the pH of the glass specimens abruptly changes due to the surface effect of V2O5 while bulk effects become robust after about 30 minutes. The measured hardness of three glass samples shows high HV-values and a slight linear increment is observed for higher V2O5 contents. The current-voltage (I-V) characteristic connected to the electrical conductivity of the glass specimen (20S80V) shows a relatively higher and non-linear trend of conductivity which reveals the behavior of a semiconductor. Moreover, temperature-dependent electrical resistivity measurement of the same sample (20S80V) manifests the semiconducting nature up to 427 °C as well.

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“…The shielding behavior of gamma radiation, optical properties of lead borate containing vanadium and structural properties of vanadium lead glasses show that vanadium plays a rule of a modifier (Rada et al, 2015;Abdelghany et al, 2012;Ghoneim et al, 2011). The effect of transition element on AC conductivity of borate glasses, vanadium borate glasses as rechargeable ionic batteries, elastic and structural properties of alkali borosilicate glasses containing vanadium, the structure and some physical properties of both borophosphate and borosilicate glasses containing vanadium have been studied (Ibrahim et al, 2017;Choi and Ryu, 2015;Laopaiboon and Bootjomchai, 2015;Afyon et al, 2014;Petru, 2010;Kashif et al, 2009;Marzouk et al, 2006;Assem, 2005;Khattak et al, 2003).…”

Section: Introductionmentioning

confidence: 99%