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- W2022892669 abstract "Phonon dispersion curves for low-frequency transverse modes propagating in the basal plane have been measured in the alkali-metal---graphite intercalation compounds K${mathrm{C}}_{8}$, Cs${mathrm{C}}_{8}$, K${mathrm{C}}_{24}$, and Rb${mathrm{C}}_{24}$ by means of neutron spectroscopy. The acoustic branches show an almost quadratic dispersion relation at small $q$, characteristic of strongly layered materials. The optical branches of stage-1 compounds can be classified as either graphitelike branches showing dispersion, or as almost dispersionless alkali-metal-like modes. Macroscopic shear constants ${mathrm{C}}_{44}$ and layer-bending moduli have been obtained for the intercalation compounds by analyzing the data in terms of a simple semicontinuum model. In stage-2 compounds, a dramatic softening of the shear constant by about a factor of 8 compared with pure graphite has been observed. Low-temperature results on K${mathrm{C}}_{24}$ indicate the opening of a frequency gap near the alkali-metal Brillouin-zone boundary, possibly due to the formation of the alkali-metal superstructure." @default.
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- W2022892669 date "1982-11-15" @default.
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- W2022892669 title "Neutron scattering investigation of layer-bending modes in alkali-metal—graphite intercalation compounds" @default.
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- W2022892669 doi "https://doi.org/10.1103/physrevb.26.5919" @default.
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