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- W1991550142 abstract "We report a detailed x-ray scattering study of the structure of stage-2 K- and Rb-intercalated graphite single crystals, as a function of temperature. The graphite-host samples were characterized by a low level of stage impurities but the degree of stacking disorder was high. The diffuse scattering from the room-temperature two-dimensional (2D) liquidlike structure of the alkali metals has been measured. It reveals subtle but meaningful differences between K and Rb. The in-plane liquid-solid transitions and the associated growth of interlayer correlations (2D-3D crossover) have been studied through scans of the main and satellite reflections. The stacking faults of the graphite host appear to be transferred to the intercalate. In the case of ${mathrm{KC}}_{24}$, a model calculation based on an average hexagonal K layer, with a subsequent partial relaxation of the K atoms in the graphite sites, provides a good fit to the observed reflection intensities. At lower temperatures, the K layers are confirmed to undergo a hexagonal-oblique symmetry-breaking transition at ${mathit{T}}_{mathit{L}}$ensuremath{sim}95 K, while the Rb layers stay hexagonal down to 10 K. Moreover, complex stacking sequences of the intercalate develop as the temperature is reduced, and in ${mathrm{RbC}}_{24}$ one observes a clear loss of the stacking correlations. This is due presumably to a frustration of the K sublattice coming from interlayer and intralayer interactions." @default.
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- W1991550142 date "1990-07-01" @default.
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- W1991550142 title "X-ray study of the liquid and solid phases of the alkali metals in<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant=normal>KC</mml:mi></mml:mrow><mml:mrow><mml:mn>24</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>- and<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant=normal>RbC</mml:mi></mml:mrow><mml:mrow><mml:mn>24</mml:mn></mml:mrow></…" @default.
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- W1991550142 doi "https://doi.org/10.1103/physrevb.42.725" @default.
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