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Neutron Scattering Studies of the Ordered Structure of C 24 Rb

A neutron elastic scattering measurement has been performed on C 24 Rb at temperatures between 106 K and 165 K. The observed extinction rule of the diffraction can be explained on the basis of a simple model: Rb layers form a triangular lattice with fundamental wave vector | G R 0 |=1.20 A -1 , which is modulated by the graphite layers. The modulation is described by a static distortion wave, which manifests itself in the appearance of a satellite peak at | G R 0 - G 0 |=1.78 A -1 , for example, where | G 0 |=2.95 A -1 is the fundamental in-plane wave vector of graphite. This model leads to a prediction that the Rb layer is rotated relative to the graphite layer by ∼9°.