Study of CaO–WO3–P2O5 glass system by dielectric properties, IR spectra and differential thermal analysis

Subbalakshmi, P.; Veeraiah, N.

doi:10.1016/s0022-3093(01)01039-0

Cited by 169 publications

(58 citation statements)

References 26 publications

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“…The value of N(E F ), i.e., the density of the defect energy states near the Fermi level, is evaluated using the equation [86] σ(ω) = ηe 2 KT [N(E F )] 2 α −5 ω ln ν ph ω 4 ,…”

Section: Dielectric Propertiesmentioning

confidence: 99%

Spectroscopic and dielectric studies on MnO doped PbO–Nb2O5–P2O5 glass system

Mohan

Reddy

Jayasankar

et al. 2008

Journal of Alloys and Compounds

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“…The value of N(E F ), i.e., the density of the defect energy states near the Fermi level, is evaluated using the equation [86] σ(ω) = ηe 2 KT [N(E F )] 2 α −5 ω ln ν ph ω 4 ,…”

Section: Dielectric Propertiesmentioning

confidence: 99%

Spectroscopic and dielectric studies on MnO doped PbO–Nb2O5–P2O5 glass system

Mohan

Reddy

Jayasankar

et al. 2008

Journal of Alloys and Compounds

Self Cite

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“…Therefore, the spectral domain useful for the structural approach concerns the region of 1,400-400 cm −1 . Table 1 represents the position of the [2,10,12,14]. The typical IR feature of P 2 O 5 glasses are the P=O band at 1,378 cm −1 [18].…”

Section: Infrared Spectramentioning

confidence: 99%

“…Many glassy materials have been synthesized inside various binary or ternary systems using network forming oxides such as B 2 O 3 , P 2 O 5 , and TeO 2 and alkali or silver oxides as network modifiers [1]. In general, the properties of a glass depend upon its composition and to a considerable extent upon its structure [2]. Transition metal oxides (TMO) mixed with P 2 O 5 oxide can form homogenous vitreous materials.…”

Section: Introductionmentioning

confidence: 99%

Optical properties of glasses in the Li2O–MoO3–P2O5 system

Azmoonfar

Hekmatshoar

Mirzayi

et al. 2008

Ionics

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Glasses xLi 2 O-(50-x)(MoO 3 ) 2 -50P 2 O 5 with x= 10, 20, 30, and 40 mol% were prepared and their optical and electrical properties were investigated. Analysis of the IR spectra revealed that the Li + ions act as a glass modifier that enter the glass network by breaking up other linkages and creating non-bridging oxygens in the network. The optical absorption edge of the glasses was measured for specimens in the form of thin blown films and the optical absorption spectra of those were recorded in the range 200-800 nm. From the optical absorption edges studies, the optical band gap (E opt ) and the Urbach energy (E e ) values have been evaluated by following the available semiempirical theories. The linear variation of (αhν) 1/2 with hν, is taken as evidence of indirect interband transitions. The E opt values were found to decrease with increasing Li 2 O content by causing increase in the number of nonbridging oxygens in network. The Urbach tail analysis gives the width of localized states between 0.48 and 0.74 eV.

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“…10,16 Generally, alkali-rich glasses exhibit dominant ion conductivity, while TMI-rich glasses exhibit dominant electronic conductivity. 17,18 Conductivities in glasses containing vanadium oxide arise from the presence of V 4+ and V 5+ . EPR spectra of V 2 O 5 containing glasses also originates from V 4+ paramagnetic centres, whose outer electronic structure 3p 6 , 3d 1 enables unpaired magnetic moments of 3d 1 electrons to interact with the electromagnetic field in the microwave range, whereas the electronic structure of V 5+ is 3p 6 , which has total electron spin zero.…”

Section: Introductionmentioning

confidence: 99%

Conductivity studies on microwave synthesized glasses

et al. 2015

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Conductivity measurements have been made on xV 2 O 5 − (100 − x) [0.5 Na 2 O + 0.5 B 2 O 3 ] (where 10 ≤ x ≤ 50) glasses prepared by using microwave method. DC conductivity (σ ) measurements exhibit temperatureand compositional-dependent trends. It has been found that conductivity in these glasses changes from the predominantly 'ionic' to predominantly 'electronic' depending upon the chemical composition. The dc conductivity passes through a deep minimum, which is attributed to network disruption. Also, this nonlinear variation in σ dc and activation energy can be interpreted using ion-polaron correlation effect. Electron paramagnetic resonance (EPR) and impedance spectroscopic techniques have been used to elucidate the nature of conduction mechanism. The EPR spectra reveals, in least modified (25 Na 2 O mol%) glasses, conduction is due to the transfer of electrons via aliovalent vanadium sites, while in highly modified (45 Na 2 O mol%) glasses Na + ion transport dominates the electrical conduction. For highly modified glasses, frequency-dependent conductivity has been analysed using electrical modulus formalism and the observations have been discussed.

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Study of CaO–WO3–P2O5 glass system by dielectric properties, IR spectra and differential thermal analysis

Cited by 169 publications

References 26 publications

Spectroscopic and dielectric studies on MnO doped PbO–Nb2O5–P2O5 glass system

Spectroscopic and dielectric studies on MnO doped PbO–Nb2O5–P2O5 glass system

Optical properties of glasses in the Li2O–MoO3–P2O5 system

Conductivity studies on microwave synthesized glasses

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