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Properties and Structure of Glasses in the System PbO‐GeO 2
Author(s) -
TOPPING J. A.,
HARROWER I. T.,
MURTHY M. K.
Publication year - 1974
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1974.tb10860.x
Subject(s) - microstructure , molar volume , refractive index , mineralogy , materials science , analytical chemistry (journal) , thermal expansion , electrical resistivity and conductivity , viscosity , ion , alkali metal , scanning electron microscope , chemistry , thermodynamics , composite material , chromatography , physics , optoelectronics , organic chemistry , quantum mechanics
Glasses are readily made from compositions containing up to 45 mol% PbO. The deviation of molar volume from ideality plotted vs composition shows a broad minimum at 70 to 80 mol% GeO 2 , similar to the behavior of the alkali‐GeO 2 glasses, indicating that the change in coordination of the Ge 4+ ion from 4‐ to 6‐fold occurs in this system, although maxima are not seen in plots of density and refractive index vs composition (mol%). Light scattering and electron microscopy indicate microstructure in glasses in the composition range 10 to 30 mol% PbO. This microstructure appears to affect the dc resistivity and viscosity but not the thermal‐expansion coefficients.