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Figure 4
The mismatch values for quartz, interpreted as r.m.s. motions of O and Si atoms, and r.m.s. distortion of SiO4 polyhedra. It is clear that the vertex O atoms are far more mobile than the Si atoms, as we would expect from rigid-unit motion. The r.m.s. distortion (distance of O atoms from geometrically ideal vertices) lies well below the r.m.s. motion of O atoms, indicating that RUMs make a dominant contribution to the amplitude of the 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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