title: Optical, structural and thermal properties of sodium metaphosphate glasses containing Bi2O3with interactions of gamma rays.
abstract: Sodium metaphosphate glasses with successive increasing added Bi2O3contents (5-40%) were prepared to improve their chemical stability and increase their optical and thermal properties through the additional building BiO6and BiO3units. The optical spectrum of the base metaphosphate glass reveals strong UV absorption due to the presence of trace iron (Fe3+) ions present as impurities. Glasses containing additional 5, 7.5 and 10% Bi2O3show further band around 406nm which can be related to absorption of Bi3+ions. With increasing the Bi2O3content, this near visible band is observed to disappear indicating peculiar behavior needing further work. Gamma irradiation causes only minor changes in the position of the strong UV peaks but an obvious induced visible broad band centered at 452-460nm in the base and Bi2O3containing glasses. This induced band is related to the generation of phosphorus oxygen hole center or non bridging oxygen hole center as revealed by various authors. FTIR results reveal characteristic vibrational bands due to phosphate groups and with the addition of Bi2O3, some interference of BiO vibrational units are expected. Gamma irradiation causes limited changes in the IR spectra due to suggested shielding effect of the heavy metal oxide Bi2O3.
authors: Glass Research Department, National Research Centre, 33 EL Bohouth St. (Former EL Tahrir St.), Dokki, P.O. 12622, Giza, Egypt. Electronic address: marzouk_nrc@yahoo.com.
authors: M A
authors: MA
authors: Marzouk
authors: Glass Research Department, National Research Centre, 33 EL Bohouth St. (Former EL Tahrir St.), Dokki, P.O. 12622, Giza, Egypt.
authors: F H
authors: FH
authors: ElBatal
authors: Glass Research Department, National Research Centre, 33 EL Bohouth St. (Former EL Tahrir St.), Dokki, P.O. 12622, Giza, Egypt.
authors: K M
authors: KM
authors: ElBadry
authors: Glass Research Department, National Research Centre, 33 EL Bohouth St. (Former EL Tahrir St.), Dokki, P.O. 12622, Giza, Egypt.
authors: H A
authors: HA
authors: ElBatal
keywords: Bi(2)O(3), Optical–FTIR; Gamma irradiation; Sodium metaphosphate glass; Thermal properties