Abstract
This article reviews our recent work on the α-β phase transition of quartz. The transition occurs on the four levels of spatial scale, namely through the structural change within the unit cell, the incommensurate modulation (150∼300 Å), the super modulation (30∼100 µm) and the formation of a domain structure (∼mm). The usefulness of X-ray topography or the combination with goniometry is emphasized. The incommensurate modulation waves are essentially a set of transversal acoustic waves which, however, is modified by a coupling with optical modes particularly near the α phase.
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