Effect of Li2O on structure and optical properties of lithium bismosilicate glasses

Ahlawat, Neetu; Sanghi, Sujata; Agarwal, Ashish; Rani, Suman

doi:10.1016/j.jallcom.2009.01.116

Cited by 44 publications

(22 citation statements)

References 29 publications

(48 reference statements)

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“…2 Deconvolution, by Gaussian fitting, of the active broad regions, 1,200-400 cm -1 , of the FTIR spectra of the glasses (G1-G7) whose chemical compositions are given in Table 1 [10, [15][16][17][18][19][20][21][22][23][24], it is known that the existence of absorption bands in the ranges 600-450 and 900-800 cm -1 in the infrared spectra of Bi 2 O 3 -based glasses indicate the presence of [BiO 6 ] octahedral and [BiO 3 ] pyramidal structural units. The absorption bands situated in the range 1,105-1,080 cm -1 can be assigned to the silicate asymmetrical stretching vibration [8]. The asymmetrical bending vibration of the Pb-O bond is also located in the same region [15,24].…”

Section: Ftir Spectramentioning

confidence: 91%

“…The bands situated at 895-880 cm -1 correspond to the Bi-O symmetrical stretching vibration from BiO 6 octahedral structural units. While the bands appeared at 850-820 cm -1 correspond to the Bi-O symmetrical stretching vibration from BiO 3 pyramidal structural units [8,10,12,15]. In the latter spectral region, the silicate symmetrical stretching mode can also be found [8].…”

Section: Ftir Spectramentioning

confidence: 93%

“…It is known that as the Si-O-Si bond angle increases this band is shifted to higher wave number, i.e. towards 1,100 cm -1 [8]. The appearance of IR bands in the wave number range 1,055-1,025 cm -1 can be ascribed to the PbO 4 and BiO 3 structural units [24].…”

Section: Ftir Spectramentioning

confidence: 96%

“…It is accepted that the main vibrational modes appeared above 400 cm -1 in mid infrared range are associated with structural chain in the glass network. These network modes are well separated from the metal ion site vibrational modes active in the far infrared region [8,14]. Figure 1 shows the FTIR spectra of the studied glasses in the 4,000-400 cm -1 wave number range in which the active vibrational IR bands, assigned to [PbO n , n = 3 and/ or 4], [BiO n , n = 3 and 6] and [SiO 4 ] structural units, are located in the mid-region of the infrared spectrum, i.e.…”

Section: Ftir Spectramentioning

confidence: 98%

“…They have special applications in the area of thermal and mechanical sensors, reflecting windows, low-loss fiber optic and infrared (IR)-transmitting materials (because of their long infrared cut-off wavelengths in excess of 9 lm) [5,6]. They are also used to produce, after appropriate annealing, high temperature superconductors with controllable microstructure [7,8].…”

Section: Introductionmentioning

confidence: 99%

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Structure–property correlations in the SiO2–PbO–Bi2O3 glasses

Abo-Naf

Elwan

Marzouk

2011

J Mater Sci: Mater Electron

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SiO 2 -PbO-Bi 2 O 3 glasses having the composition of 35SiO 2 -xPbO-(65-x)Bi 2 O 3 (where x = 5, 10, 15, 20, 25, 35, 45; in mol%) have been prepared using the conventional melting and annealing method. Density, molar volume and Vickers microhardness of the prepared glasses were measured. Infrared (IR) and UV-visible spectroscopic techniques were used for structural studies of these glasses. Density as well as the microhardness increase systematically and, conversely, the molar volume decreases with increasing the lead oxide content. This behavior can be explained by the correlation with the glass structure. Increasing the lead oxide content (C20 mol%) increases the network former PbO 4 groups which can play an important role in increasing the connectivity and compactness of the glass matrix via increasing the cross-linking with the other constituent silicate and bismuthate structural units. The increased compactness may explain, in turn, the increase of the density and microhardness. IR spectra reinforce the idea that bismuth participates in the glassy network predominantly as BiO 6 octahedral structural units. UV-VIS optical absorption spectra revealed UV-charge transfer absorption bands related to the contribution of Pb 2? ions in the region 350-385 nm; in addition to the extrinsic absorption of trace iron impurities in the range 220-290 nm. In the visible region, three optical bands in the ranges 415-435, 605-650 and 880-890 nm were correlated with the contribution of electronic transitions in Bi 3? ions. Calculation of the optical mobility gap and the width of the energy tail of glass from the UV-VIS absorption indicated a slight increase followed by a decrease in their values. The behavior change occurred at the glass in which PbO content is 20 mol% where lead oxide starts to participate into the glassy matrix as a network former. The combination of analytical FTIR and UVvisible spectroscopy provided a consistent picture of structure-property relations in this glass system.

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Section: Ftir Spectramentioning

confidence: 91%

Section: Ftir Spectramentioning

confidence: 93%

Section: Ftir Spectramentioning

confidence: 96%

Section: Ftir Spectramentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Structure–property correlations in the SiO2–PbO–Bi2O3 glasses

Abo-Naf

Elwan

Marzouk

2011

J Mater Sci: Mater Electron

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Use of niobium oxide nanoparticles as nanofillers in PVP/PVA blends to enhance UV–visible absorption, opto‐linear, and nonlinear optical properties

Ali

Sayed

Algarni

et al. 2022

Vinyl Additive Technology

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Transition metal oxide (TMO)-filled polymer films have numerous applications, including electromagnetic shielding and nonlinear optical devices.Nb 2 O 5 -filled polyvinyl pyrrolidone (PVP)/polyvinyl alcohol (PVA) blend was prepared using a solution casting process. Pristine and nanocomposite films from these blends were studied. X-ray diffraction (XRD), scanning electron microscopy (SEM), and Fourier infrared spectroscopy confirmed the formation of nanocomposites via interfacial interactions between the polymer chains and Nb 2 O 5 nanoparticles. These nanoparticles influence the amorphous nature and transparency of the PVA/PVP blends. The improvement of D opt (optical density) becomes particularly obvious in blended polymer films with considerable Nb 2 O 5 -nanofiller concentrations. By increasing the weight percentage of Nb 2 O 5 , the probability of producing additional levels in the bandgap increased. The optical absorption coefficient of each nanocomposite film was less than 10 6 m À1 , indicating indirect electron transfer. Thus, the indirect optical band-gap declined from 3.9 to 1.9 eV as calculated from Tauc's and the absorption spectral fitting (ASF) formula. Additionally, the effects of Nb 2 O 5 on the extinction coefficient, refractive index, highfrequency (ε ∞ ), and static-frequency (ε o ) dielectrics have been reported. The nonlinear refractive index and optical susceptibilities (x 1 and x 3 ) were enhanced by increasing the Nb 2 O 5 content in the blend. The penetration depth (δ) and optical limiting (OL) properties were also investigated. The developed nanocomposite materials could be used for advanced technologybased devices such as reflective coatings, opto-linear, and nonlinear optoelectronic applications.

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