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- W2000683996 abstract "Li2O–Al2O3–ZrO2–SiO2 glasses mixed with different concentrations of TiO2 (ranging from 0 to 5.0 mol%) were synthesised and their dielectric properties (dielectric constant, loss tan δ, a.c. conductivity σ) investigated over wide ranges of frequency and temperature. Studies of optical absorption, ESR, infrared (IR) and photoluminescence properties have also been undertaken. A decrease in dielectric parameters with increasing concentrations of TiO2 has been observed and this is attributed to an increasing proportion of titanium ions occupying network-forming positions rather than going into interstitial positions. A.C. conductivity in the high-temperature region appears to be connected both to electronic transfer and ionic movements, but conduction attributed to such processes seems to be hampered by the entry of titanium ions into the network-forming positions. Analysis of the results of the IR spectral studies have indicated that there is a decreasing degree of disorder in the glass network with increasing TiO2 content. The optical absorption and ESR spectral studies have revealed that titanium ions exist in both Ti3+ and Ti4+ states in the glasses. Luminescence spectra exhibited an emission band in the visible region and the luminescence efficiency increased with TiO2 content. The excitation of substitutionally positioned octahedral Ti4+ ions is identified as being responsible for the observed luminescence emission." @default.
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- W2000683996 date "2011-02-21" @default.
- W2000683996 modified "2023-09-25" @default.
- W2000683996 title "Dielectric and spectroscopic investigations of lithium aluminium zirconium silicate glasses mixed with TiO<sub>2</sub>" @default.
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- W2000683996 doi "https://doi.org/10.1080/14786435.2010.531056" @default.
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