Twinning of aragonite - the crystallographic orbit and sectional layer group approach

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 angstrom) 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.
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Article dans une revue
Acta Crystallographica Section a Foundations of Crystallography, Wiley-Blackwell, 2015, 71 (2), pp.195-202. 〈10.1107/S2053273314027156〉
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https://hal.univ-lorraine.fr/hal-01521895
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Soumis le : vendredi 12 mai 2017 - 14:43:52
Dernière modification le : lundi 14 mai 2018 - 10:32:06

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Mohamed-Amine Marzouki, Bernd Souvignier, Massimo Nespolo. Twinning of aragonite - the crystallographic orbit and sectional layer group approach. Acta Crystallographica Section a Foundations of Crystallography, Wiley-Blackwell, 2015, 71 (2), pp.195-202. 〈10.1107/S2053273314027156〉. 〈hal-01521895〉

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