Electron Spin Resonance (ESR) and optical absorption spectra of a manganese doped soda-lime-silicate glass system
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Author list: Srisittipokakun N., KedKaew C., Kaewkhao J., Kittiauchawal T., Thamaphat K., Limsuwan P.
Publication year: 2009
Journal: Kasetsart Journal - Natural Science (0075-5192)
Volume number: 43
Issue number: 5 SUPPL.
Start page: 360
End page: 364
Number of pages: 5
ISSN: 0075-5192
Languages: English-Great Britain (EN-GB)
Abstract
A (65-x)SiO2:10CaO:25Na2O:xMnO2 glass system with 0 ≤ x ≤ 0.5 mol% was prepared and investigated by X-ray diffraction, optical absorption and ESR spectroscopies. The XRD pattern of undoped glass confirmed the formation of an amorphous vitreous structure. The optical absorption spectra exhibited a predominant broad band around 500 run and its increase was clearly observed from 0.1 mol% of MnO2. This band corresponded to an allowed transition from 5Eg- →5T2g, of Mn3+ ions. When the MnO 2 concentration was increased, the absorption band due to Mn 3+ ions dominated. The ESR spectra results exhibited resonance signals at g = 2.0 with a sextet of hyperfine lines and less intensity at g ≈ 4.3. The group of hyperfine lines at g ≈ 2.0 represented Mn2+ ions in octahedral symmetry. However, these lines were broader and disappeared for higher MnO2 concentrations. This behavior indicated the reduction of Mn2+ ions in the glass system as the concentration of MnO 2 was increased by increasing the Mn3+ ions.
Keywords
Manganese ion, Soda-lime-silicate glass, Transition metal ion
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