ISSN:
1551-2916
Source:
Blackwell Publishing Journal Backfiles 1879-2005
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
,
Physics
Notes:
The chemical reactions between P2O5-ZnO-H2O ultraphosphate glasses and water were characterized between room temperature and 500°C, using thermogravimetry, differential scanning calorimetry, X-ray diffraction, and 31P nuclear magnetic resonance. Water adsorption and hydrolysis reactions of the glass leads to the formation of H3PO4 and crystalline ZnH2P2O7 below 200°C. The rate of water adsorption increases, owing to the hygroscopicity of the hydrolysis products of the glass. Devitrification occurs at 250°C via surface reactions. The microstructure of the devitrified glass consists of crystalline Zn2P4O12 and a liquid phase containing hydrolysis products of P2O5 like metaphosphoric acid (HPO3)n. Devitrification is finally followed by water desorption at higher temperatures.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1111/j.1151-2916.1998.tb02511.x
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