Characteristics of Glassy PbO-GeO₂ Binary System by X-Ray Diffraction, Infrared Absorption, Dielectric Constant, and Intrinsic Absorption

Four characteristics of the glassy PbO-GeO 2 system were examined. X-ray diffraction pattern of the sample of 50 mol % PbO showed the maximum intensity at d -value 2.885 Å which was in accordance with that of the compound PbO·GeO 2 (relative intensity 60 %). Infrared absorption band of the glassy GeO 2 at 11.5 µ, which would be assigned as ν 3 mode of tetrahedral GeO 4 unit, shifted toward longer wavelength side with increasing PbO content and the shift showed a plateau at 47-50 mol % PbO. Dielectric constant also kept neatly constant value at 47-50 mol % PbO The wavelengths corresponding to the intrinsic absorption coefficients per PbO mole fraction ( e. g. 70 cm -1 /m.f.) increase linearly with increasing PbO content, having the inflection point at 45 and 55 mol % PbO. The ionic character of the bond GeO 4 -Pb is discussed on the basis of the results.