Etude de la cristallisation du trimet aphosphate de sodium vitreux. : Aspect cristallochimique
| Autor: | Patrick Germain, J.P. Bastide, Lakhdar Azzouz |
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| Rok vydání: | 1994 |
| Předmět: |
Diffraction
Chemistry Annealing (metallurgy) Mechanical Engineering Sodium trimetaphosphate Condensed Matter Physics medicine.disease Sodium phosphates law.invention chemistry.chemical_compound Crystallography Mechanics of Materials law medicine Anhydrous Physical chemistry General Materials Science Dehydration Crystallization Hydrate |
| Zdroj: | Materials Research Bulletin. 29:351-358 |
| ISSN: | 0025-5408 |
| DOI: | 10.1016/0025-5408(94)90067-1 |
| Popis: | The influence of annealing parameters (temperature and duration) on the crystallization process of vitreous sodium-trimetaphosphate has been studied by X-ray diffraction under air-free conditions. The phenomenon is undoubtly initiated by very small amounts of water being inevitably present. A crystalline phase grows on the sample surface with very strong crystallographic orientations, the structure of which being related to the structure of a sodium-trimetaphosphate hydrate. Water is gradually released when annealing temperature and/or duration is increased. Crystallization of anhydrous trimetaphosphate occurs first on the surface before spreading over the whole volume of the solid. |
| Databáze: | OpenAIRE |
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