Properties and Structure of Copper Ultraphosphate Glasses
The structures of xCuO · (1 − x)P2O5 glasses (0 less-than-or-equals, slant x less-than-or-equals, slant 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 Pdouble bond; length as m-dashO bonds on isolated Q3 tetrahedra and Pdouble bond; length as m-dashO bonds on View the MathML source tetrahedra that participate in the coordination environments of the Cu-octahedra, respectively. As CuO content increases, the intensity of the Pdouble bond; length as m-dashO band associated with the View the MathML source tetrahedra increases to a maximum x not, vert, similar 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.
E. Metwalli et al., "Properties and Structure of Copper Ultraphosphate Glasses," Journal of Non-Crystalline Solids, Elsevier, Oct 2004.
The definitive version is available at http://dx.doi.org/10.1016/j.jnoncrysol.2004.07.058
Materials Science and Engineering
Petroleum Research Fund
Keywords and Phrases
Asymmetric Vibration; Copper Ultraphosphate Glasses; Metaphosphate Structure; Phosphate Matrix; Vacuum Sealed Silica Ampoules; Vibrational Spectroscopies
Article - Journal
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