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Article Dans Une Revue Synthetic Metals Année : 2015

Chemical, structural and electrical resistivity of two first stage arsenic-potassium-graphite intercalation compounds

Jamal Assouik
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Claire Hérold

Résumé

The action on graphite of liquid arsenic-potassium alloys leads to the formation of a new series of graphite intercalation compounds. Two ternary phases of first stage have been observed and isolated. The alpha-type phase is obtained by action on graphite of composition alloys close to that of defined K3As compound. On the other hand, the beta-phase is easily obtained by action on graphite of K-As alloys whose chemical stoichiometry is equal or near to the 37 at.% As eutectic point composition. The Fourier transform analysis of the 001 reflexions family of these two phases showed that the intercalated metallic sheets between graphitic gaps in these phases are generally three-layered stacking according to K/As/K sequence along c-axis. An exam, by means classical X-ray diffraction and transmission electronic microscope (TEM) of the in-plane structure of these compounds revealed that the intercalated metallic sheets are perfectly crystallised and an equatorial stratum was defined for each of them. Electrical conductivity measurements have been carried out on these phases along both axis of graphite and showed that they are strongly anisotropic and exhibit a metallic character in parallel to graphitic plans.

Domaines

Matériaux
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Dates et versions

hal-01289107 , version 1 (16-03-2016)

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Citer

Jamal Assouik, Claire Hérold, Philippe Lagrange. Chemical, structural and electrical resistivity of two first stage arsenic-potassium-graphite intercalation compounds. Synthetic Metals, 2015, 210 (B), pp.251-257. ⟨10.1016/j.synthmet.2015.08.027⟩. ⟨hal-01289107⟩
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