Premium
Color and Selected Properties of PbO─BiO 1.5 ─GaO 1.5 Glasses
Author(s) -
Huang WenHai,
Ray Chandra S.,
Day Delbert E.
Publication year - 1994
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.1151-2916.1994.tb07261.x
Subject(s) - dissolution , crucible (geodemography) , molar volume , ion , absorption edge , analytical chemistry (journal) , mineralogy , thermal expansion , crystallization , materials science , glass transition , absorption (acoustics) , chemistry , thermodynamics , metallurgy , band gap , composite material , physics , computational chemistry , optoelectronics , organic chemistry , chromatography , polymer
The density; molar volume; thermal expansion coefficient; dissolution rate in water, HC1, and NaOH; glass transition and crystallization temperatures; and the absorption edge in the ultraviolet‐visible and infrared were measured for PbO─BiO1.5─GaO1.5 glasses. The range of compositions investigated was x PbO (100 − (x + y) )BiO 1.5 . yGaO 1.5 for x between 20 and 60 cat% and y of 20, 25, 30, and 35 cat%. The glass‐forming tendency increased with increased GaO 1.5 and decreased with increased PbO or BiO 1.5 . The compositional dependence of these properties was consistent with the weight, size, charge, and bond strength of the cations. The Ga 3 + ions in these glasses are believed to act primarily as network‐forming cations, whereas the majority of the Bi 3+ and Pb 2+ ions behave as network‐modifying cations. It is suggested that a small friction of the lead ions are present as Pb 4+ . Depending upon melting conditions, these glasses ranged in color from brown to yellow. Various attempts, including containerless melting, were made to obtain colorless glasses, but no conditions were found which totally eliminated the color. The least color (pale yellow) was obtained when the glasses were melted in an air or nitrogen atmosphere in an alumina or gold crucible.