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Figure 12
Comparative graph of the r.m.s. motions of Si and O atoms, and the r.m.s. distortion distance in SiO4 polyhedra, for quartz (open symbols), cristobalite (black symbols) and zeolite Y (grey). The magnitude of the motions in cristobalite and the zeolite are considerably greater than in quartz, reflecting the greater geometric flexibility of the structures. For all three silicates, the ratio of the r.m.s. oxygen motion to the r.m.s. distortion distance is large, indicating that rigid-unit motion is a dominant contribution to the amplitude of dynamic disorder.

Journal logoJOURNAL OF
APPLIED
CRYSTALLOGRAPHY
ISSN: 1600-5767
Volume 37| Part 4| July 2004| Pages 536-544
doi:10.1107/S0021889804008957
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