Effect of Variable Oxidation States of Vanadium on the Structural, Optical, and Dielectric Properties of B₂O₃–Li₂O–ZnO–V₂O₅ Glasses

Abstract

In the present study, the effect of variable vanadium oxidation states on the structural, optical, and dielectric properties of vanadium oxide containing lithium borate glasses has been investigated. Electron paramagnetic resonance studies indicate that vanadium in these glasses is mostly in the V state, having a tetragonal symmetry. As the glass composition of VO increases, tetragonality also increases at the cost of octahedral symmetry. The photoluminescence (PL) spectra of these glasses are dominated by zinc oxide transition, whereas the peaks pertaining to the vanadyl group are not visible in the PL spectra. The optical absorption spectra show a single wide absorption band, which is attributed to V ions in these glasses. The ac conductivity of the glasses increases with an increase in vanadium content. The highest electrical conductivity observed is ∼10 S cm at 250 °C for the glass with 2.5 mol % VO. Electrical conductivity is dominated by electron conduction, as indicated by the activation energy calculation.

Synthesis, characterization of V2O5 nanoparticles and determination of catalase mimetic activity by new colorimetric method

“…On the basis of these reactions, the use of another metal was considered to follow the degradation of H 2 O 2 . The motivation of the current work was to develop an advanced colorimetric method to be used for the determination of the catalase mimetic activity of pentavalent metal oxide V 2 O 5 nanoparticles [26,27]. V 2 O 5 nanoparticles were prepared and used as catalase mimetic enzyme to compare the activity of the vanadia nanoparticles with that of the manganese in the above given reactions.…”

Dielectric relaxation studies in Sm2O3 doped boro-zinc-vanadate glasses

“…There have been electrical and dielectric investigations conducted on vanadate doped glasses, V2O5-ZnO [1-2, 14], B2O3-V2O5 [15][16][17][18] and B2O3-V2O5-ZnO [19]. They observed that high concentration of the transition metal cations produces electronic conduction and the ionic contribution is blocked, exhibited single relaxation process.…”

In Vitro Studies Demonstrate Antitumor Activity of Vanadium Ions from a CaO-P2O5-CaF2:V2O5 Glass System in Human Cancer Cell Lines A375, A2780, and Caco-2

“…The addition of transition metal oxides (TMOs) in the composition of phosphate glass typically leads to the depolymerization of the vitreous phosphate network and to the formation of new P–O–TM bonds [ 13 ]. These structural modifications are linked to the amount of doping and have a strong influence on the physical, chemical, and magnetic properties of these glasses [ 19 , 20 , 21 , 22 ]. Moreover, including TMOs in the P 2 O 5 network not only improves their properties but can also have beneficial effects from a biological perspective [ 23 ].…”