Gold-potassium sheets intercalated into graphite: Chemistry and structure of a first stage ternary compound

Mélissa Fauchard 1 Sébastien Cahen 1 Philippe Lagrange 1 Ghouti Medjahdi 1 Pascal Berger 2 Claire Hérold 1
2 LEEL - UMR 3685 - Laboratoire d'Etudes des Eléments Légers
NIMBE UMR 3685 - Nanosciences et Innovation pour les Matériaux, la Biomédecine et l'Energie (ex SIS2M)
Abstract : A ternary graphite-potassium-gold compound K1.3Au1.5C4 was synthesized by immersing a pyrographite platelet in various potassium metal-based molten alloys. Numerous reaction parameters were investigated (duration, temperature, composition of the alloy) in order to determine the stability conditions of the ternary compound. Using complementary X-ray diffraction and ion beam analysis experiments, the optimal conditions of preparation of this compound have been pointed out. The composition and homogeneity were evidenced by ion beam analysis and X-ray diffraction allowed to determine its repeat distance (1311pm) and its c-axis stacking sequence (K-Au-Au-Au-K). The 2D unit cell observed thanks to Transmission Electron Microscopy (TEM) is square with a = 1192pm, no-commensurate with that of graphite.
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Submitted on : Wednesday, November 6, 2019 - 4:08:44 PM
Last modification on : Tuesday, November 26, 2019 - 9:08:04 AM

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Mélissa Fauchard, Sébastien Cahen, Philippe Lagrange, Ghouti Medjahdi, Pascal Berger, et al.. Gold-potassium sheets intercalated into graphite: Chemistry and structure of a first stage ternary compound. Carbon, Elsevier, 2018, 140, pp.182-188. ⟨10.1016/j.carbon.2018.08.001⟩. ⟨hal-02351979⟩

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