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Oxidation–Reduction Equilibrium in Copper Phosphate Glass Melted in Air
Author(s) -
Bae ByeongSoo,
Weinberg Michael C.
Publication year - 1991
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.1151-2916.1991.tb04299.x
Subject(s) - crucible (geodemography) , copper , vaporization , inert gas , redox , quartz , chemistry , materials science , analytical chemistry (journal) , metallurgy , mineralogy , inorganic chemistry , chromatography , composite material , computational chemistry , organic chemistry
Copper phosphate glasses with 40, 50, and 60 mol% CuO in batch were melted in air at 1000°, 1100°, and 1200°C using quartz or alumina crucibles, and the [Cu 2+ ]/[Cu total ] ratio variations with melting time were measured. Glasses were oxidized during melting and reached equilibrium [Cu 2+ ]/[Cu total ] ratios which were independent of melting temperature and identical for the 40 and 50 mol% CuO content glasses. Structural considerations seemed to have determined oxidation‐reduction equilibrium rather than an equilibrium redox reaction. Also, the effects of crucible type on the oxidation‐reduction balance were examined. It was found that a quartz crucible is more inert and has less effect on the oxidation‐reduction equilibrium of glass than an alumina crucible. Crucible contamination and phosphorus vaporization were found to diminish as the CuO content in the batch was increased.