Versatile behavior upon intercalation by chemical vapor transport of lanthanide trichlorides into graphite
✍ Scribed by S. Cahen; R. Vangelisti
- Book ID
- 104009482
- Publisher
- Elsevier Science
- Year
- 2011
- Tongue
- English
- Weight
- 478 KB
- Volume
- 49
- Category
- Article
- ISSN
- 0008-6223
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✦ Synopsis
Lanthanide trichlorides which hardly react with graphite have been moved into the latter by chemical vapor transport (CVT) thanks to a gaseous complex LnAl 3 Cl 12 resulting from the reaction between LnCl 3 and AlCl 3 . This complex molecule also allows the intercalation of LnCl 3 into graphite, AlCl 3 playing the role of a gaseous medium and/or co-intercalated species, depending on the structure of the pristine chloride. Well-defined stage-2 to 4 graphite intercalation compounds (GICs) have been synthesized by this CVT method, but efforts to get richer stage-1 compounds are still in progress. The 0 0 l structural study of stage-2 GICs performed by XRD reveals that interplanar distances of LnCl 3 -GICs are higher than those classically observed for intercalated transition metal chlorides. The composition of all the stage-2 compounds studied has been established and ternary C-LnCl 3 -AlCl 3 compounds with a significant excess of chlorine have been observed. The 2D structures of the different LnCl 3 -GICs have been characterized by X-ray or electron diffraction and show that structural differences are noted between pristine and intercalated LnCl 3 .