Properties and structure of copper ultraphosphate glasses |
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Authors: | E. Metwalli M. Karabulut M.M. Morsi |
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Affiliation: | a Graduate Center for Materials Research, University of Missouri-Rolla, MO 65401, USA b Fraunhofer Institut Silicatforschung, ORMOCERs Department, D-97082 Würzburg, Germany c Department of Physics, University of Kafkas, 36100 Kars, Turkey d Department of Physics, Creighton University, Omaha, NE 68178, USA e Glass Research Department, National Research Center, Dokki, Cairo 12311, Egypt |
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Abstract: | The structures of xCuO · (1 − x)P2O5 glasses (0 ? x ? 0.50) prepared in vacuum sealed silica ampoules were investigated using vibrational spectroscopies. With the addition of CuO, both infrared and Raman spectra indicate a systematic transformation from a three-dimensional ultraphosphate network dominated by Q3 tetrahedra into a chain-like metaphosphate structure dominated by Q2 tetrahedra. IR spectra clearly show two distinct Q3 sites with bands at 1378 and 1306 cm−1, assigned to PO bonds on isolated Q3 tetrahedra and PO bonds on tetrahedra that participate in the coordination environments of the Cu-octahedra, respectively. As CuO content increases, the intensity of the PO band associated with the tetrahedra increases to a maximum x ∼ 0.33, then decreases with a concomitant increase of the intensity of the band at 1265 cm−1, due to the asymmetric vibration of the PO2 groups on Q2 tetrahedra. When x > 0.33 the isolated Cu-octahedra begin to share common oxygens to form a sub-network in the phosphate matrix. The effects of glass structure on the glass properties, including density, refractive index, and glass transition temperature, are discussed. |
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Keywords: | G188 P147 |
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