Spectroscopic studies of lead arsenate glasses doped with nickel oxide

Rao, G. Srinivasa; Sudhakar, B.K.; Prasanna, H.N.L.; Devasahayam, V.; Rao, M.V. Sambasiva

doi:10.1016/j.jnoncrysol.2010.11.029

Cited by 16 publications

(6 citation statements)

References 36 publications

(36 reference statements)

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“…In glass materials, a portion of Ni 2þ ions may occupy tetrahedral positions, besides octahedral occupation. Quantitative properties of modifiers and glass formers, as well as their field strength, the size of the ions in the glass matrix, modifier cation motion, and other factors, all influence the concentration of ions in tetrahedral or octahedral sites [6]. The octahedral nickel ions function as modifiers, generating structural flaws, whereas the tetrahedral ions combine with the basic glass network.…”

Section: Introductionmentioning

confidence: 99%

Impact of high NiO content on the structural, optical, and dielectric properties of calcium lithium silicate glasses

Ibrahim

Abo-Mosallam

Mahdy

et al. 2022

J Mater Sci: Mater Electron

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Glasses with the composition (11.5 − ×) CaO − 23.5Li2O − 65SiO2: × NiO mol. % (0 $$\le \times \leq$$ ≤ × ≤ 11.5) were synthesized by melt-quenching method. And a number of physical parameters have been established. The refractive index and energy gap were also used to estimate the metallization criterion, where these glasses have shown values fallings between high (insulators) and low (metals), indicating that they are semiconductors. The XRD pattern shows the amorphous nature of investigated glasses. A number of spectroscopic analyses of the studied glasses were performed, in relation to NiO content, including Fourier transform infrared (FTIR) and UV–Visible diffuse reflectance spectroscopy (DRS). Due to compositional changes, FTIR measurements have revealed structural changes in the glass network. Furthermore, with increasing NiO content, the asymmetrical bands of silicate units increase. The creation of Ni–O–Si bonds in the silicate matrix has been attributed to the introducing heavier Ni+2 as [NiO4]2− tetrahedral species in substitution of the lighter silicon ion in the [SiO4]4− network, but it could also operate as a network modifier in glass materials. The Ni2+ ion may have behaved as a network intermediary, causing more compact structure. The mechanism of charge transfer in the glass compositions under investigation is studied using broadband dielectric spectroscopy. For the first time, the relationship between the hopping time of free ions and dc conductivity is illustrated. All of the glasses under investigation have the same charge transport mechanism. The results suggest the semiconducting nature of these glasses.

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Section: Introductionmentioning

confidence: 99%

Impact of high NiO content on the structural, optical, and dielectric properties of calcium lithium silicate glasses

Ibrahim

Abo-Mosallam

Mahdy

et al. 2022

J Mater Sci: Mater Electron

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“…1(e)) spectrum is prociently divided into the tungsten orbitals W 4f 5/2 and W 4f 7/2 , which have binding energies of 37.31 eV and 35.21 eV, respectively, conrming the presence of the W 6+ oxidation state of WO 3 . 24,25 The split between the W 4f 7/2 and W 4f 5/2 core levels is 2.1 eV, indicating a +6 oxidation state of W in WO 3 . The Raman spectrum of the as-synthesized WO 3 structure is depicted in Fig.…”

Section: Resultsmentioning

confidence: 99%

3D-engineered WO₃ microspheres assembled by 2D nanosheets with superior sodium storage capacity

Sengupta,

Sudakar,

Kundu

2024

RSC Adv.

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“…Semiconductor characterization is a key enabler in the development of semiconducting technology. Among the intermediate metals oxide, tungsten trioxide WO 3 as a ntype semiconductor with large indirect band gap (≈ 2.4 − 3.7 eV) is extensively studied due to its optoelectronic properties in possible applications such as smart windows [1][2][3][4][5][6], front contacts in photovoltaic solar cells [7][8][9], variable-reflectance mirrors, and etc. [10,11].…”

Section: Introductionmentioning

confidence: 99%

Enhancing electrical and thermoelectrical properties of $\mathrm{WO}_3$ thin films by spray pyrolysis technique

Asghari¹,

Zad²

2019

Preprint

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Tungsten trioxide WO 3 thin films have been deposited on glass substrates by spray pyrolysis technique with three different rates R 1 = 1 ml/min (sample A 1 ), R 2 = 3 ml/min (sample A 2 ) and R 3 = 7 ml/min (sample A 3 ). We have then annealed all samples for 2 h at 500 • C in air. Structural, morphological, optical and electrical properties of WO 3 thin films are investigated in detail. According to the FESEM images, all layers are formed in various circular strings with different diameters. The diameter of each strain decreases when the deposition rate increases. The XRD structural analysis indicates that before annealing, except the lowest deposition rate sample R 1 with a polycrystalline nature and mixed tetragonal and hexagonal phases, other samples are grown in an amorphous phase. After annealing, sample A 2 (with rate R 2 = 3 ml/min) remains in an amorphous phase, while samples A 1 and A 3 (with the corresponding rates R 1 = 1 ml/min and R 3 = 7 ml/min respectively) are polycrystalline. Moreover, from UV-Vis. spectra analysis we found that by increasing spray rate the band gap of the layers monotonically decreases. This phenomenon is the result of attenuation of the quantum confined effect. The thermoelectric properties confirm being n-type conductivity of the layers, also variation in the current-voltage characteristic is in accordance with the oxygen vacancies sites. We found that the sample A 3 with the highest rate has lowest resistivity.

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Spectroscopic studies of lead arsenate glasses doped with nickel oxide

Cited by 16 publications

References 36 publications

Impact of high NiO content on the structural, optical, and dielectric properties of calcium lithium silicate glasses

Impact of high NiO content on the structural, optical, and dielectric properties of calcium lithium silicate glasses

3D-engineered WO₃ microspheres assembled by 2D nanosheets with superior sodium storage capacity

Enhancing electrical and thermoelectrical properties of $\mathrm{WO}_3$ thin films by spray pyrolysis technique

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Spectroscopic studies of lead arsenate glasses doped with nickel oxide

Cited by 16 publications

References 36 publications

Impact of high NiO content on the structural, optical, and dielectric properties of calcium lithium silicate glasses

Impact of high NiO content on the structural, optical, and dielectric properties of calcium lithium silicate glasses

3D-engineered WO3 microspheres assembled by 2D nanosheets with superior sodium storage capacity

Enhancing electrical and thermoelectrical properties of $\mathrm{WO}_3$ thin films by spray pyrolysis technique

Contact Info

Product

Resources

About

3D-engineered WO₃ microspheres assembled by 2D nanosheets with superior sodium storage capacity