Radiation induced color centers in 50PbO–50P2O5 glass

El-Deen, L.M. Sharaf; Al-Salhi, M.S.; Elkholy, M. M.

doi:10.1016/j.jnoncrysol.2008.09.021

Cited by 8 publications

(3 citation statements)

References 20 publications

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“…These NBO's bind excited electrons less tightly than the bridging oxygen, and hence result in the decrease in the band gap energy. Similar results have been observed for the lead phosphate glasses [20] and it was suggested that the non-bridging oxygen ion content increases with increasing gamma dose, shifting the band edge to lower energies and leading to a decrease in the value of E g .…”

Section: Band Gap Energysupporting

confidence: 82%

Structural Investigations of Gamma-Irradiated PbO Glasses

Singh

Mudahar

Thind³

et al. 2015

SSP

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The effects of gamma radiations on the optical, physical and structural properties of zinc lead borate xZnO-2xPbO-(1-3x)B2O3 and zinc lead borosilicate xZnO-2xPbO-1/2(1-3x)B2O3-1/2(1-3x)SiO2 glasses have been investigated. Differential Scanning Calorimetry (DSC), Ultraviolet-Visible (UV-Vis) and Fourier Transmission Infra-red (FTIR) spectroscopic techniques have been used to compare the properties of samples before and after gamma irradiation by a dose of 2.5 kGy. The variation of density, optical band gap (Eg), IR absorption bands and glass transition temperature (Tg) indicates that the structure of glasses changes due to irradiation. The radiation induced changes created by-ray in the optical, physical and thermal parameters in both the prepared series of glasses have been discussed for their possible application as radiation shielding material.

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Section: Band Gap Energysupporting

confidence: 82%

Structural Investigations of Gamma-Irradiated PbO Glasses

Singh

Mudahar

Thind³

et al. 2015

SSP

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“…Meanwhile two peaks at 740 cm -1 and 920 cm -1 only exhibit in Figure 1 phosphate. These peaks were assigned to symmetric vibration and asymmetric vibration of PO 2 group [2]. A broad band at 1080 cm -1 indicates the vibration of P-Oin non bridging oxygen [10].…”

Section: Resultsmentioning

confidence: 99%

“…Moreover, borate glass offers high ionic conductivity for energy storage and micro-ionic application. As for phosphate glass system, it offered some unique physical characteristic such as high thermal expansion coefficients, high electrical conductivity, ultraviolet transmission and optical characteristic [2].…”

Section: Introductionmentioning

confidence: 99%

Structural and Luminescence Study of Rare Earth and Transition Metal Ions Doped Lead Zinc Borophosphate Glasses

Pang

Eeu

Leong

et al. 2014

AMR

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A series of glasses with composition of xPbO-(50-x)ZnO-yB2O3-(50-y)P2O5 with 0 x 50 mol% and 10 y 20 mol% were prepared by melt quenching technique, with 30 minutes pre-heating and 10 minutes for melting. The structural properties of prepared samples were studied using Fourier Transform-Infrared spectroscopy. The glasses were mainly based on PO2, BOP and BO3 unit. In order to obtain luminescence properties, another series of sample at composition 20PbO-30ZnO-10B2O3-40P2O5 doped with Fe2+, Ti2+, Y2+ and Nd2+ were prepared. These samples were investigated using Photoluminescence Spectroscopy with different excitation wavelength to compare results. Results showed that with the presence of rare earth and transition metal ions as activator in lead zinc borophosphate glass system give rise to luminescence of visible light.

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Color changes in modern and fossil teeth induced by synchrotron microtomography

Richards

Jabbour

Horton

et al. 2012

American J Phys Anthropol

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Studies using synchrotron microtomography have shown that this radiographic imaging technique provides highly informative microanatomical data from modern and fossil bones and teeth without the need for physical sectioning. The method is considered to be nondestructive; however, researchers using the European Synchrotron Radiation Facility have reported that color changes sometimes occur in teeth during submicron scanning. Using the Advanced Light Source, we tested for color changes during micron-level scanning and for postexposure effects of ultraviolet light. We exposed a 2.0-mm wide strip (band) to synchrotron light in 32 specimens, using multiple energy levels and scan durations. The sample included modern and fossilized teeth and bone. After scanning, the specimens were exposed to fluorescent and direct ultraviolet light. All teeth showed color changes caused by exposure to synchrotron radiation. The resulting color bands varied in intensity but were present even at the lowest energy and shortest duration of exposure. Color bands faded during subsequent exposure to fluorescent and ultraviolet light, but even after extensive ultraviolet exposure, 67% (8/12) of UV-exposed teeth retained some degree of induced color. We found that the hydroxyapatite crystals, rather than the organic component, are the targets of change, and that diagenesis appears to impact color retention. Color changes have significance beyond aesthetics. They are visible indicators of ionization (chemical change) and, therefore, of potential physical damage. It is important for researchers to recognize that synchrotron microtomography may damage specimens, but adopting suitable safeguards and procedures may moderate or eliminate this damage.

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Radiation induced color centers in 50PbO–50P2O5 glass

Cited by 8 publications

References 20 publications

Structural Investigations of Gamma-Irradiated PbO Glasses

Structural Investigations of Gamma-Irradiated PbO Glasses

Structural and Luminescence Study of Rare Earth and Transition Metal Ions Doped Lead Zinc Borophosphate Glasses

Color changes in modern and fossil teeth induced by synchrotron microtomography

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