Gold-potassium sheets intercalated into graphite: Chemistry and structure of a first stage ternary compound - Archive ouverte HAL Access content directly
Journal Articles Carbon Year : 2018

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

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Mélissa Fauchard
  • Function : Author
  • PersonId : 774127
  • IdRef : 18206686X
Sébastien Cahen
Philippe Lagrange
  • Function : Author
  • PersonId : 774128
  • IdRef : 191064688
Claire Hérold

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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Dates and versions

hal-02351979 , version 1 (06-11-2019)

Identifiers

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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, 2018, 140, pp.182-188. ⟨10.1016/j.carbon.2018.08.001⟩. ⟨hal-02351979⟩
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