Dielectric dispersion in Li2O–MoO3–B2O3 glass system doped with V2O5

Rao, L. Srinivasa; Reddy, M. Srinivasa; Reddy, M. Rami; Veeraiah, N.

doi:10.1016/j.jallcom.2007.10.016

Cited by 59 publications

(11 citation statements)

References 45 publications

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“…In general, vanadium ions mostly exist, in glasses, in V 4+ and V 5+ states. However, these ions may also exist in the glass networks in V 2+ and V 3+ states [10]. As network former, the structure of these glasses, similar to the phosphate glasses, is predominant of [VO 4 ] tetrahedral units.…”

Section: +mentioning

confidence: 99%

“…When V 2 O 5 is added to other glass formers, in low quantities (<10%) [11], it can also be inserted structurally as modifier. V 2 O 5 is identified as n-type semiconductor for low value of the V 4+ /V 5+ ratio with the electrical conductivity (which is known to be electron hopping between V 4+ to V 5+ ions) of 10 -5 to 10 -7 S/m and therefore they present a high potential for applications as memory and switching devices [10].…”

Section: +mentioning

confidence: 99%

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Electrical, dielectric and structural properties of borovanadate glass systems doped with samarium oxide

Graça

Fawzy

Badr

et al. 2011

Phys. Status Solidi C

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Glasses doped with rare earth (RE) ions are widely studied due to the numerous applications of these systems (active media for solid state lasers, optical telecommunication, non‐linear optical materials, electro‐optic devices, etc.). Boron trioxide, B2O3, is a known glass forming oxide with a relative low melting temperature. The addition of a transition metal oxide, such as V2O5, promotes the exhibition of semiconducting properties making these promising systems for several technological applications, such that ones involved in solar energy conversion devices. It is known that alkali borovanadate glasses, like alkali borate glasses themselves, are ionically conducting materials. Despite their importance there are only few studies on these glasses reported on literature. Thus, the alkali‐borovanadate glass system constitutes a family with high interest from the electrical and dielectric point of view. The effect of the increment of alkali quantity in the electrical and dielectric response of these glasses and the physical/structural explanation are questions which will be addressed. In this work, the transparent glass samples with molar composition 0.01Sm2O3‐0.99[0.85B2O3‐(0.15‐x)Li2O‐xV2O5] with x = 0, 0.1, 0.2, 0.35, 0.5 and 2 (mol%) were prepared by conventional melting technique. The prepared samples were fully characterized using different experimental techniques such as, differential thermal analysis (DTA), X‐ray diffraction (XRD), electrical and dielectric measurements. The samples structure, electrical and dielectric properties as a function of vanadium ions content was explored and discussed (© 2011 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)

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Section: +mentioning

confidence: 99%

Section: +mentioning

confidence: 99%

Electrical, dielectric and structural properties of borovanadate glass systems doped with samarium oxide

Graça

Fawzy

Badr

et al. 2011

Phys. Status Solidi C

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“…As mentioned earlier, the W 5+ ions similar to Li + ions act as modifiers and create dangling bonds and non-bridging oxygen ions by disrupting Si-O-Si, W-O-W, Si-O-W, Al-O-Si, Zr-O-Si linkages. The defects thus produced create easy path ways for the migration of charges that would build up space charge polarization and facilitate to an increase in the dielectric parameters as observed [40][41][42]. The decreasing trend of dielectric parameters with the concentration of WO 3 suggests increasing degree of rigidity in the glass network.…”

mentioning

confidence: 88%

“…The slight decay visualized in the intensity of the signal with the concentration of the WO 3 suggests the decreasing proportions of paramagnetic W 5+ ions in the glass network. The variations in the ESR line-shape and the intensity in the other glass systems have been previously explained by a number of investigators on the basis of variations in the concentration of paramagnetic spices like W 5+ ions [39][40][41]. The near invariance of the difference between g and g (anisotropy factor) with the concentration of WO 3 in the glass network indicates that the structural modifications experienced by W 5+ octahedron are nominal.…”

mentioning

confidence: 95%

The role of coordination and valance states of tungsten ions on some physical properties of Li2O–Al2O3–ZrO2–SiO2 glass system

Rao¹,

Ravikumar²,

Srikumar³

et al. 2011

Journal of Non-Crystalline Solids

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“…Most of the studies available on MoO3 containing glasses are on the understanding of their structure by spectroscopic investigations [19−21] and ionic conductivity studies [22]. Molybdenum trioxide (MO3) forms glasses [23][24][25][26][27][28][29][30] fairly easily in which Mo is known to exist in Mo 5+ (4d 1 ) and Mo 6+ (4d 0 ) states [27,[29][30][31]. These glasses are known to contain [MoO6/2] or [OMoO5/2] -groups [32] in the glass network.…”

Section: Absorption Patternsmentioning

confidence: 99%