Chemical vapor transport for intercalation reactions: synthesis of a 1st stage DyCl3 graphite intercalation compound
Résumé
In this paper, we develop a chemical vapor transport process involving the gaseous species DyAl3Cl12 (g) in order to perform the intercalation of dysprosium trichloride into graphite. Even if it is known that such a reaction must be performed under chlorine atmosphere, this work reveals that an increase of the Cl2 pressure in the synthesis reactor improves the intercalation yield. By combination of gravimetric measurement, EDX analysis and 00l X-ray diffraction experiments, we evidence the synthesis of a novel 1 st stage DyCl3-Graphite Intercalation Compound (GIC). The sample obtained in this study is a mixture of 1 st stage DyCl3-GIC and 2 nd stage AlCl3-GIC. However, considering the 1 st stage DyCl3-GIC, the data collected in this work are in agreement with a Ic repeat distance of 982 pm and a C8.1DyCl3.9 formula. Along the c-axis, the intercalated sheet is three-layered and exhibits a Cl-Dy-Cl stacking sequence existing in pristine chloride.
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