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- Title
Twinning of aragonite - the crystallographic orbit and sectional layer group approach.
- Authors
Marzouki, Mohamed-Amine; Souvignier, Bernd; Nespolo, Massimo
- Abstract
The occurrence frequency of the {110} twin in aragonite is explained by the existence of an important substructure (60% of the atoms) which crosses the composition surface with only minor perturbation (about 0.2 Å) and constitutes a common atomic network facilitating the formation of the twin. The existence of such a common substructure is shown by the C2/ c pseudo-eigensymmetry of the crystallographic orbits, which contains restoration operations whose linear part coincides with the twin operation. Furthermore, the local analysis of the composition surface in the aragonite structure shows that the structure is built from slices which are fixed by the twin operation, confirming and reinforcing the crystallographic orbit analysis of the structural continuity across the composition surface.
- Subjects
ARAGONITE; TWINNING (Crystallography); PERTURBATION theory; ATOMS; CRYSTAL structure
- Publication
Acta Crystallographica. Section A, Foundations & Advances, 2015, Vol 71, Issue 2, p195
- ISSN
2053-2733
- Publication type
Article
- DOI
10.1107/S2053273314027156