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Reaction Chemistry of Crystalline Allotropes of Germania
Author(s) -
Seibles Lawrence,
Mitchell James W.,
Blitzer Lawrence D.
Publication year - 1989
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.1151-2916.1989.tb07666.x
Subject(s) - solubility , tetragonal crystal system , chemical reaction , chemistry , fusion , solubilization , aqueous solution , chemical engineering , mineralogy , inorganic chemistry , organic chemistry , crystal structure , philosophy , linguistics , biochemistry , engineering
Chemical reactions potentially useful for converting intractable allotropes of germania (aged hexagonal and tetragonal forms) into reactive products are investigated. The effectiveness of reactions in aqueous solutions under basic, basic‐reductive, acidic‐oxidative, and acidic‐reductive conditions is reported in terms of germania solubilization. Solubility versus time of reaction at elevated temperatures is reported for the most effective medium, 2.5M NaOH. For six flux media, fusion reactions and respective temperatures are reported with the percentage of germania solubilized from the fused melt. Additionally, the crystalline germania materials are characterized by infrared and differential thermal analyses. Chemical procedures compatible with batch or continuous processing methods are discussed.