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The methods of stationary and pulsed absorption spectroscopy were used to study the optical properties of xPbO·(1–x)SiO 2 glasses produced by cooling of a molten mixture of chemically pure oxides. The spectral dependence of the absorption in the range of the short-wavelength edge obeys the Urbach rule. As the PbO concentration increases, a red shift of the optical transparency cutoff is observed...
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