Electrical properties of glasses in the Na2O–MoO3–P2O5 system

Bih, L.; Omari, Mohamed El; Réau, Jean-Maurice; Nadiri, A.; Yacoubi, Abdelmajid; Haddad, M.

doi:10.1016/s0167-577x(01)00245-2

Cited by 61 publications

(46 citation statements)

References 16 publications

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“…These bands shift to a higher frequency as the MoO 3 content increases. These results suggest that the bonds P=O and Mo-O are transformed into P-O-Mo and Mo-O-Mo bridging bonds when Mo/P ratio increases [1,16]. The absorption bands near 1,100 and 1,060 cm −1 have been related to the P-O − stretching frequencies [10,17,14].…”

Section: Infrared Spectramentioning

confidence: 83%

“…In the case of the glasses studied here, Li 2 O when added to binary system of the glass (MoO 3 -P 2 O 5 ), act as network modifiers and the P-O-P, P-O-Mo bonds were broken and non-bridging oxygen atoms appeared in the neighboring of Li + cations, resulting in an ionic conductivity of Li + cations [1,15,16].…”

Section: Infrared Spectramentioning

confidence: 99%

“…This degradation of the network is accompanied with the formation of weak link such as Li + ...O − bonds and the presence of NBOs in network [1,15,16]. The absorption bands around 500 cm −1 which appears in all glasses are attributed to a fundamental frequency of the (PO 4 ) 3− group [10, 14, and 17].…”

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].…”

Section: Introductionmentioning

confidence: 99%

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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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Section: Infrared Spectramentioning

confidence: 83%

Section: Infrared Spectramentioning

confidence: 99%

Section: Infrared Spectramentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

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

Azmoonfar

Hekmatshoar

Mirzayi

et al. 2008

Ionics

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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%

Infrared spectroscopy of undoped and Cu-doped (80-x)Sb2O3-20Li2O-xMoO3 glasses

Petkova¹,

Boubaker²,

Vasilev³

et al. 2016

AIP Conference Proceedings

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A Self‐Ordered, Crystalline–Glass, Mesoporous Nanocomposite for Use as a Lithium‐Based Storage Device with Both High Power and High Energy Densities

Zhou

Hibino

et al. 2005

Angewandte Chemie

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Lithium-based storage devices with both high power and high energy densities are necessary for electric devices, especially for electric vehicles (EV) and other mobile or portable electric devices.[1] Herein we introduce a new concept to design a novel electrode material having a self-ordered, crystalline-glass, mesoporous nanocomposite (CGMN) structure for such industrial needs. The 5-nm frameworks of the CGMN are assembled in a compact arrangement from electrode-active nanocrystals with a small quantity of glass phase. The 4-nm uniform mesochannels of the CGMN can be filled with electrolyte solution during use to provide electrolyte and lithium-ion pathways throughout the material. In addition, the high surface area of the CGMN reduces the effective specific current density, and the three-dimensional glass network in the framework of the CGMN is able to incorporate a high content of electronic conductive oxides above the percolation-threshold value to form an electronic path, and to add lithium ions as a network modifier during the first insertion process to form an ionic path. The experimental results show that the specific capacities (energy density) at high current densities (power density) can be improved several hundred fold when the CGMN replaces TiO 2 powder as the electrode of a lithium-based storage device.An electric vehicle (EV) powered by a rechargeable battery is an ideal solution to reduce environmental pollution as it is a clean energy source. However, the power densities of rechargeable batteries are still too low to support such industrial needs, even though their energy densities are high. The development of such an energy-storage device with both high power and high energy densities has been widely studied.[1] There are two typical approaches in this field: one is to increase the energy density of the capacitor, which is often studied by measurement of the electrical double-layer capacity (EDLC), and the other is to improve the specific capacity of the rechargeable battery by a rapid chargedischarge process, especially for lithium-based rechargeable batteries. Recently, a great deal of effort has been spent on improving the energy density of the EDLC by increasing the effective surface area of carbon-based materials, [2] although the resulting densities are still too low. In the second approach there are four main problems that have to be solved: [3,4] a) the particle size needs to be decreased to reduce the required diffusion length in the active materials; b) the effective specific current density needs to be reduced in the rapid charge-discharge process; c) a high cycle performance needs to be achieved even during the rapid charge-discharge process; and d) the electronic conductivity of the electrode materials needs to be increased.The diffusion of lithium ions is very complex because the nature of the electrolyte phase, the solid-liquid interface, the tortuosity, and the size of the nanoparticles have to be considered.[5] Herein we only consider the the overall process by assuming that th...

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Electrical properties of glasses in the Na2O–MoO3–P2O5 system

Cited by 61 publications

References 16 publications

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

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

Infrared spectroscopy of undoped and Cu-doped (80-x)Sb2O3-20Li2O-xMoO3 glasses

A Self‐Ordered, Crystalline–Glass, Mesoporous Nanocomposite for Use as a Lithium‐Based Storage Device with Both High Power and High Energy Densities

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