Abstract
The characteristic features of modulated structures which appear as intermediate phases between a high-symmetry high temperature phase and a low temperature phase of lower symmetry are described. Two examples (NaNO2 and LiAlSiO4) are discussed. For NaNO2 previously published results are reviewed. For LiAlSiO4, the modulation of the structure is interpreted as being caused by the formation of domains which fluctuate in their width. This domain hypothesis is supported by model calculations. The course of structure determination is outlined.
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