Electrical and dielectric analysis of phosphate based glasses doped with alkali oxides

Graça, M.P.F.; Melo, B. M. G.; Prezas, P.R.; Freire, Francisco Nivaldo Aguiar; Bih, L.

doi:10.1016/j.matdes.2015.07.043

Cited by 16 publications

(4 citation statements)

References 43 publications

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“…Na + , Mg 2+ ) present in the glass network [36]. dispersed phases in the aforementioned porous materials appears appealing for possible applications in electrocatalytic reactions, such as water splitting for hydrogen and oxygen evolution [38], integrating also a preprocessing step to assure a high-purity product.…”

Section: [19]mentioning

confidence: 99%

Porous glass-ceramics made from microwave vitrified municipal solid waste incinerator bottom ash

Flesoura

Monich

Alarcón

et al. 2021

Construction and Building Materials

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Section: [19]mentioning

confidence: 99%

Porous glass-ceramics made from microwave vitrified municipal solid waste incinerator bottom ash

Flesoura

Monich

Alarcón

et al. 2021

Construction and Building Materials

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“…These defects produce easy pathways for the migration of charge carriers [61]. The AC conductivity is more associated with the dipolar mechanism between the modifier ions and the non-bridging oxygen ions [62]. However, in lower CuO concentration, the ionic conductivity via Na + predominates leading to decrease in the conductivity with decreasing Na 2 O concentration.…”

Section: Dielectric Propertiesmentioning

confidence: 99%

Dielectric and optical properties of CuO containing sodium zinc phosphate glasses

Elbashar

Badr

Elshaikh

et al. 2016

PAC

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Dielectric and optical properties of 45 P 2 O 5-34 ZnO-(20 −x)Na 2 O-1 Al 2 O 3-xCuO glasses (0 ≤ x ≤ 5) were investigated. The frequency and composition dependencies of the dielectric parameters were analysed and discussed. The values of real part of dielectric constant (RPDC) lie between 748 to 1169 for RPDC Max , and 654 to 1031 for RPDC Min. The range of values of imaginary part of dielectric constant (IPDC) extends from 39.4 to 57.5 for IPDC Max and from 27.3 to 40.1 for IPDC Min. It was observed that each of these parameters begins to decrease with increasing CuO content, but further addition of CuO causes their rise. Thus, small amount of CuO causes a decrease in both RPDC and IPDC until CuO content reaches 2 mol%, thereafter, they nearly return to their original values at 5 mol% of CuO. Similar behaviour was observed for AC conductivity. Transmittances of the investigated glasses were also measured and used to estimate their optical absorption coefficients and optical band gaps. The optical energy gap is ∼4 eV for the samples with up to 4 mol% CuO, while it is somewhat higher (∼5 eV) for the glass with 5 mol% CuO.

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“…Niobium phosphate glasses possess remarkable functional properties which make them attractive for diverse fields of application, from optical and laser technology, 1–6 electrochemical devices 7–13 to nuclear waste immobilization, 14 and biomedicine 15,16 . Generally, the addition of niobium oxide to phosphate glass increases density, glass transition temperature, elastic modulus, refractive index, improves chemical durability, and decreases thermal expansion coefficient 2–4,14,17 …”

Section: Introductionmentioning

confidence: 99%

“…In combination with alkali oxide, niobium oxide can be incorporated in a phosphate network in a wide compositional range which makes these glass systems interesting from the point of view of electrical properties. Indeed, studies on niobium phosphate glasses containing different alkali oxides, 7–10,13,21 as well as their mixture 12 reveal that structural modifications induced by the incorporation of niobium into phosphate glass have a significant impact on the ionic conductivity. Moreover the study by Graça et al 8 on alkali niobium phosphate glasses shows that while ionic transport takes place above room temperature, at lower temperatures niobium actively contributes to the electrical processes by the electron transfer between niobium ions in different valence states, that is, Nb 5+ and Nb 4+ .…”

Section: Introductionmentioning

confidence: 99%

Transport of potassium ions in niobium phosphate glasses

et al. 2021

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The influence of Nb2O5 on the structure and ionic conductivity of potassium phosphate glasses was investigated in glasses with composition xNb2O5–(100‐x)[0.45K2O–0.55P2O5], x = 10–47 mol%. The Raman spectra of glasses reveal a transition from predominantly orthophosphate to predominantly niobate glass network with increasing Nb2O5 content. In the glass structure, niobium forms NbO6 octahedra which are interlinked with phosphate units for the glass containing 10 mol% Nb2O5, but for higher Nb2O5 content they become mutually interconnected via Nb‐O‐Nb bonds. The transport of potassium ions was found to be strongly dependent on the structural characteristics of the glass network. While the mixed niobate‐phosphate glass network hinders the diffusion of potassium ions by providing traps that immobilize them and/or by blocking the conduction pathways, predominantly niobate glass network exhibits a rather facilitating effect which is evidenced in the trend of DC conductivity as well as in the features of the frequency‐dependent conductivity and typical hopping lengths of potassium ions.

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Electrical and dielectric analysis of phosphate based glasses doped with alkali oxides

Cited by 16 publications

References 43 publications

Porous glass-ceramics made from microwave vitrified municipal solid waste incinerator bottom ash

Porous glass-ceramics made from microwave vitrified municipal solid waste incinerator bottom ash

Dielectric and optical properties of CuO containing sodium zinc phosphate glasses

Transport of potassium ions in niobium phosphate glasses

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