FTIR of binary lead borate glass: Structural investigation

Othman, H. A.; Elkholy, Hagar; Hager, I.Z.

doi:10.1016/j.molstruc.2015.10.076

Cited by 80 publications

(60 citation statements)

References 18 publications

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“…Borates are well known for their extended glass forming range and the fact that they form glasses with oxides of many different elements of the periodictables . Borate glasses are also known for their structural variations and wide variety of superstructural units, and consequently also for their wide range of physical properties and applications . Products include, but are not limited, to sealing glasses with low melting temperatures, ion conducting glasses, and materials for optical applications .…”

Section: Introductionmentioning

confidence: 99%

“…However, for neutron detection, a constituent ion of high neutron absorption such as B ion is necessary. One typical subset of borate glass systems encompasses borate glasses with high barium or lead levels which are characterized by high refractive indices and low T g . Many studies can be found in the literature regarding the structure of lead‐containing glasses, with special focus on the changing role of lead from network modifier at low PbO concentrations to network former at high PbO levels, even forming a PbO‐pseudophase .…”

Section: Introductionmentioning

confidence: 99%

“…The different polymerization degree of fourfold bonded [BO 4/2 ] − and threefold bonded BO 2/2 O − has an important impact on the glasses’ physical and spectroscopic properties . However, the cross‐linking capability of the modifier cation is equally important …”

Section: Introductionmentioning

confidence: 99%

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Mixed barium‐lead borate glasses studied by optical and vibrational spectroscopy

Othman

Herrmann

Möncke

2019

Int J of Appl Glass Sci

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Glasses of the ternary lead-barium borate series (70−x) B 2 O 3 -30 BaO-xPbO with x = 0.05 to 30 mol% were studied for their optical properties by photoluminescence (PL) and UV-Vis absorption spectroscopy. Variations in the s-p transition of Pb 2+ were followed as variations of the lead content and varying optical basicities of the glass. The UV cutoff of the undoped glass sample is observed at about 340 nm and increasing PbO addition results in a red shift of the optical absorption edge to 480 nm for the glass with x = 30 mol%. In lead barium borate glasses, the emission intensity increases up to 4 mol% PbO before decreasing at higher PbO levels. Additionally, the series was studied regarding structural variations by Raman and infrared spectroscopy. The fraction of tetrahedrally coordinated [BO 4/2 ] − and of trigonal borate units with nonbridging oxygen atoms (metaborate and pyroborate) increases with PbO addition. The molar volume of the prepared glasses is found to increase with increasing lead content. The glass basicity, as determined from the composition, correlates well with the position of the lead excitation band. K E Y W O R D SBorate glass, Pb 2+ fluorescence, Raman spectroscopy, photoluminescence, s-p transition

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Mixed barium‐lead borate glasses studied by optical and vibrational spectroscopy

Othman

Herrmann

Möncke

2019

Int J of Appl Glass Sci

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“…Furthermore, lead ions exhibit fluorescence due to the allowed electronic s→p transition of Pb 2+ ions . Lead borate glasses have shown to exhibit a large glass forming region . Because of the large difference between the masses of lead and boron atoms are vibrational modes of PbO polyhedral and the borate network well separated in the IR and Raman spectra .…”

Section: Introductionmentioning

confidence: 99%

“…Because of the large difference between the masses of lead and boron atoms are vibrational modes of PbO polyhedral and the borate network well separated in the IR and Raman spectra . Lead borate glasses have been used successfully as efficient laser host material . We are aware of the environmental aspects concerning the use of lead ions in glass melting.…”

Section: Introductionmentioning

confidence: 99%

Spectroscopic investigation of samarium‐doped lead oxyflouroborate glasses using photo and cathode luminescence

Othman

Elkholy

Hager

2016

Int J of Appl Glass Sci

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Samarium-doped lead oxyflouroborate glasses of 60 B 2 O 3 -xPbO-(40-x)LiF where (x=0-30 mol%) with 3910 20 ions/cm 3 of Sm 2 O 3, were prepared by melt quenching. UVVis absorption, photo luminescence (PL) and cathode luminescence (CL) spectroscopies were used to study the effect of varying PbO content on the spectroscopic properties of these samarium-doped glasses. The absorption of the UV-edge shifts toward higher wavelengths, not only because of higher polarizability of lead ions, but also because of the strong allowed s-p transition of Pb 2+ . Judd-Ofelts parameters were determined and indicate that the asymmetry around Sm 3+ ions increases with increasing PbO content. Ω 2 probes the asymmetry by the ratio of intensity of the hypersensitive transition ( 6 H 9/2 ) to that of purely magnetic ( 6 H 5/2 ) transition. Furthermore, an increase in the spectroscopic quality factor (Ω 4 /Ω 6 ) was observed with increasing PbO content which indicates that these glasses have the potential to be used as efficient active laser glasses. The calculated energy transfer parameter increases with increasing PbO content. Also, stark splitting increases with increasing PbO concentrations. FWHM of the CL emission peaks and stark splitting, are found to be much larger than that in PL. This was explained by the high electric field generated from the exciting electron pulses. K E Y W O R D S amorphous materials, cathode luminescence, Judd-Ofelt parameters, optical properties, photo luminescence

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Phosphorescence by Trapping Defects in Boric Acid Induced by Thermal Processing

Stagi,

Malfatti,

Zollo

et al. 2023

Advanced Optical Materials

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The phosphorescence of boric acid (BA, H3BO3) at room temperature is a puzzling phenomenon subject to controversial interpretations although the role of structural defects has not yet been considered. Heat treatments of boric acid cause its transformation into the metaboric phase and amorphous boron oxide (B2O3). The structural changes after thermal processing can create defects that become centers of luminescence and recombination channels in the visible range. In the present work, commercial boric acid is thermally processed at different temperatures. Samples treated between 200 and 400 °C exhibit remarkable phosphorescence in the visible range. At ≈480 and 528 nm, two distinct phosphorescent emissions occur, associated with trapped charge carriers recombinations identified by thermoluminescence (TL) and electron paramagnetic resonance spectroscopy (EPR). The structural and optical studies suggest that the activation of boric acid phosphorescence after heat treatment is correlated with the presence of defects. The afterglow results from a trapping and detrapping process, which delays the recombination at the active optical centers. Time‐dependent density functional study (DFT) of defective BOH molecules and clusters shows the emergence of near UV and blue optical transitions in absorption. These defects trigger the photoluminescence in thermally processed boric acid samples.

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FTIR of binary lead borate glass: Structural investigation

Cited by 80 publications

References 18 publications

Mixed barium‐lead borate glasses studied by optical and vibrational spectroscopy

Mixed barium‐lead borate glasses studied by optical and vibrational spectroscopy

Spectroscopic investigation of samarium‐doped lead oxyflouroborate glasses using photo and cathode luminescence

Phosphorescence by Trapping Defects in Boric Acid Induced by Thermal Processing

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