Structure of Modified Phospho-Silicate Glasses: Effect of Irradiation
[1]
Gomaa El-Damrawi, Department of Physics, Faculty of Science, Mansoura University, Mansoura, Egypt.
[2]
Mohamed Abou-Elzahab, Department of Chemistry, Faculty of Science, Mansoura University, Mansoura, Egypt.
[3]
Ali Dowaidar, Department of Chemistry, Faculty of Science, Mansoura University, Mansoura, Egypt.
[4]
Ahmed Hosny, Department of Nature Science, Delta University for Science and Technology, Gamasa, Egypt.
Phospho-silicate glasses containing different concentrations from CrF2 were studied by Electron Paramagnetic Resonance (EPR), X-ray diffraction (XRD), and Transmission Electron Microscopy (TEM) equipped with Electron diffraction apparatus. EPR spectroscopy offers information about oxidation states of Cr ions and their coordination symmetry in the vitreous network. The EPR spectra of Cr3+ of glass containing 10 mol% CrF2 revealed two essential resonance signals with effective g values at g = 4.93 and and g = 2.14. Presence of the two resonances is considered as a good evidence for presence of the trivalent valence for chromium ions of octahedral coordination in glass containing 10 mol.% CrF2. While, in glasses of lower CrF2 concentration, chromium cation may present as both isolated Cr3+ ions and anti-ferromagnetic exchange coupled pairs from Cr3+–Cr3+. X-ray and electron diffraction analysis of sample containing 10 mol% CrF2 revealed the crystals as a spinel-type material. TEM of sample of high CrF2 reveals a heavy accumulation of crystalline species. While glasses of lower concentrations contain isolated species of Cr cations. The irradiation dose leads to partial relaxations of the electron and hole centers causing narrowing the EPR lines and increases the splitting.
EPR Spectroscopy, Silicate Glasses, TEM Micrographs, Glass Former, Irradition
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