Elastic and inelastic neutron scattering are reported for C/sub 8/Rb in the temperature range 4 to 800 K. Several phase transitions above room temperature are reported for the first time; these consist of changes in metal layer stacking and ultimately at 747 K the onset of 2D liquid behavior. Phonon dispersion of LA and LO modes propagating along c imply a 20% increase in the interlayer force constant relative to pure graphite. The zone boundary TA mode softens dramatically with increasing temperature, which may be related to the phase transitions.
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Elastic and inelastic neutron scattering are reported for C/sub 8/Rb in the temperature range 4 to 800 K. Several phase transitions above room temperature are reported for the first time; these consist of changes in metal layer stacking and ultimately at 747 K the onset of 2D liquid behavior. Phonon dispersion of LA and LO modes propagating along c imply a 20% increase in the interlayer force constant relative to pure graphite. The zone boundary TA mode softens dramatically with increasing temperature, which may be related to the phase transitions.
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Ellenson, W.D.; Semmingsen, D. & Fischer, J.E.Neutron scattering studies of alkali metal--graphite intercalation compounds,
article,
January 1, 1977;
Upton, New York.
(https://digital.library.unt.edu/ark:/67531/metadc1074113/:
accessed July 16, 2024),
University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu;
crediting UNT Libraries Government Documents Department.
