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Reduction of Ions in Glass by Hydrogen
Author(s) -
JOHNSTON W. D.,
CHELKO A. J.
Publication year - 1970
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.1151-2916.1970.tb12111.x
Subject(s) - hydrogen , soda lime , ion , diffusion , absorption (acoustics) , inorganic chemistry , chemistry , glass transition , atmospheric temperature range , reduction (mathematics) , materials science , analytical chemistry (journal) , thermodynamics , composite material , polymer , organic chemistry , physics , geometry , mathematics
The reduction by hydrogen of Fe 3+ , Ce 4+ , and Sn 4+ in soda‐lime‐silica glass was found to be diffusion‐limited in the glass transition temperature range (500°C). The reduction was studied in fibers by chemical analysis and in bulk samples by optical absorption. Reduction to Fe 2+ , Ce 3+ , and Sn 2+ proceeds by a reaction of the type H 2 +2(ɛSi‐O) ‐ +2Fe 3+ →2Fe 2+ +2(ɛSi–OH). Since the rate of reduction by hydrogen is quite similar for these systems and since reduction cannot be accomplished with CO, it is concluded that hydrogen is the diffusing species. A mechanism is developed in which hydrogen diffuses through the glass until it is trapped by a reducible ion.
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