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- W2095331520 abstract "The optical and electrical properties of PbO-SiO 2 glasses containing 24.6 to 65 mole % PbO have been determined. While the short-wavelength cutoff increases continuously in wavelength with increasing PbO concentration, an abrupt lightening in color is observed in the vicinity of 38–40% PbO. The darker color of glasses containing 30–38% PbO has been associated with a scattering process. The origin of this scattering is discussed and is tentatively identified with the formation of microcrystals of SiO 2 in the glasses. The alternative process of liquid-liquid phase separation seems less likely, but cannot be ruled out with certainty. The electrical conductivity of all glasses investigated exhibits an Arrhenian temperature dependence. The activation energy decreases from about 1.23 eV for the 30% PbO composition to about 1.11 eV for the 50% PbO composition, and remains about constant for glasses containing higher concentrations of PbO. Addition of NH 4 Cl or Sb 2 O 3 to the batch or use of Pb(NO 3 ) 2 or Pb 3 O 4 instead of PbO as a raw material does not affect the electrical properties. The dielectric constant at 1kHz increases continuously with increasing PbO concentration, from a value in excess of 20 for the 55% PbO composition. The implications of these results for the conduction mechanism in PbO-SiO 2 glasses are discussed." @default.
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- W2095331520 date "1973-07-01" @default.
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- W2095331520 title "Optical and electrical properties of lead silicate glasses" @default.
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- W2095331520 doi "https://doi.org/10.1016/0022-3093(73)90067-7" @default.
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