Incommensurate and commensurate modulated structures
2006
This chapter discusses incommensurate and commensurate modulated structures. After an introduction to the concepts used to describe modulated structures, including the basic ideas of higher-dimensional crystallography, four-dimensional space groups and displacive and occupational modulation, superspace-group determination is outlined. Tables of Bravais lattices, geometric and arithmetic crystal classes, and superspace groups (with reflection conditions) are presented and their use is illustrated with different examples.
Keywords:
arithmetic crystal classes;
basic structural features;
Bravais classes;
centring reflection conditions;
composite crystal structures;
crystallographic systems;
higher-dimensional crystallography;
holohedry;
incommensurate modulated structures;
lattices;
Laue classes;
modulated crystal structures;
modulations;
occupation modulations;
point groups;
structure factors;
superspace groups
Keywords:
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