NEW DETAILS ON THE STRUCTURE OF THE 3-Q MODULATED PHASE OF QUARTZ TYPE

Authors
SAINTGREGOIRE P SNOECK E JANOVEC V ROUCAU C
Citation
P. Saintgregoire et al., NEW DETAILS ON THE STRUCTURE OF THE 3-Q MODULATED PHASE OF QUARTZ TYPE, Physica status solidi. a, Applied research, 139(2), 1993, pp. 361-370
Citations number
16
Categorie Soggetti
Physics, Condensed Matter
Journal title
Physica status solidi. a, Applied research → ACNP
ISSN journal
00318965
Volume
139
Issue
2
Year of publication
1993
Pages
361 - 370
Database
ISI
SICI code
0031-8965(1993)139:2<361:NDOTSO>2.0.ZU;2-D
Abstract
The 3-q incommensurate phase of quartz is investigated both from a the oretical point of view based on symmetry considerations and experiment ally by transmission electron microscopy (TEM). It is shown that harmo nics of the modulation lead to undulation of discommensurations. Close to the lock-in transition it is observed that the 6z' symmetry of the 3-q phase can be locally reduced to 3z'. Furthermore, the structure o f block boundaries which appear to be always directed along x-type axe s, is analysed.