シリケートガラス中へのアンモニウムイオンの拡散

概要

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The possibility of introducing ammonium ion into glass with and without electric field has been investigated. As the results, it was shown that the weight reduction of glass treated in ammonium bisulfate bath might mainly be attributed to the replacing reaction (2) and partly to the dehydrating condensation of the proton-glass (3).Since a small quantity of ammonium which corresponds to 2-7mole% of the removed alkali has been found in the treated glass, it is obvious that the reaction (1) also takes place to some extent accompanying the decomposition of ammonium (1)′. Ammonium in glass is considered to be metastable, as its amount varies with the condition of the experiment.The glass after the treatment has a network structurer of crack, 10-30μ in size. The forming process and the properties of the treated glass are explained based on this structure. Because of the inferior properties of this glass as porous material, it has been considered that its uses may be limited.(1) Na+(glass)+NH4+(melt)_??_NH4+(glass)+Na+(melt)(1)′ NH4+(glass)→H+(glass)+NH3↑(2) Na+(glass)+H+(melt)_??_H+(glass)+Na+(melt)(3) Proton-glass dehydration→ Dealkali glass.
社団法人日本セラミックス協会の論文
1974-01-01