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Thermal decomposition of HfCl4 as a function of its hydration state |
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| Authors: | E. Barraud,G. Le Caë r,O. Barres |
| Affiliation: | a Laboratoire de Science et Génie des Matériaux et de Métallurgie, UMR CNRS INPL 7584, Ecole des Mines, F-54042 Nancy Cedex, France b Institut de Physique et Chimie des Matériaux, GMI, UMR CNRS-ULP 7504, Ecole de Chimie, Polymères et Matériaux, 23, rue du Loess, BP 43, F-67034 Strasbourg Cedex 2, France c Groupe Matière Condensée et Matériaux, UMR CNRS-Université de Rennes-I 6626, Campus de Beaulieu, Bâtiment 11A, F-35042 Rennes Cedex, France d Laboratoire Environnement et Minéralurgie, UMR CNRS-INPL 7569, Ecole Nationale Supérieure de Géologie de Nancy, F-54501 Vandoeuvre-lès-Nancy Cedex, France |
| Abstract: | The thermogravimetric behavior of HfCl4 powders with different hydration states has been compared. Strongly hydrated powders consist of HfOCl2·nH2O with n>4. Partially hydrated powders consist of particles with a HfCl4 core and a hydrated outerlayer of HfOCl2·nH2O with n in the range of 0-8. Hydrated powders decomposed at temperature lower than 200 °C whereas the decomposition of partially hydrated powders was completed at a temperature of around 450 °C. The observed differences in decomposition temperature is related to the structure of HfOCl2·nH2O, which is different if n is higher or smaller than 4 and leads to intermediate compounds, which decompose at different temperatures. |
| Keywords: | Hafnium tetrachloride Oxychloride octahydrate Oxychloride Hydration Thermal decomposition Structure |
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