Surface alteration of zinc ultraphosphate glass in humid air at 140°C

A mechanism for the alteration of zinc ultraphosphate glass by humid air at 140°C is presented. The glass was prepared by melting a H 3PO 4–ZnO batch at 900°C for one hour, its composition is 54.6(±1.5)P 2O 5−34.2(±0.5)ZnO−11.2(±0.4)H 2O. 1H and 31P nuclear magnetic resonance shows that water adsorp...

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Bibliographic Details
Published in:Journal of non-crystalline solids 1999-10, Vol.256, p.124-129
Main Authors: Mercier, C, Montagne, L, Sfihi, H, Palavit, G
Format: Article
Language:English
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Summary:A mechanism for the alteration of zinc ultraphosphate glass by humid air at 140°C is presented. The glass was prepared by melting a H 3PO 4–ZnO batch at 900°C for one hour, its composition is 54.6(±1.5)P 2O 5−34.2(±0.5)ZnO−11.2(±0.4)H 2O. 1H and 31P nuclear magnetic resonance shows that water adsorption occurs and simultaneaously leads to the formation of monophosphoric (H 3PO 4) and diphosphoric (H 4P 2O 7) acids. The surface conductivity data are consistent with the formation on the glass surface of an acidic solution of phosphates. The thermogravimetric data shows that this solution reaches equilibrium with the atmospheric water, that decreases the adsorption rate of water.
ISSN:0022-3093
1873-4812
DOI:10.1016/S0022-3093(99)00471-8