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Twin structure in the crystallite aggregation pattern
Author(s) -
Zhao Shanrong,
Wang Qinyan,
Liu Rong,
Lu Lian,
Wang Jiyang
Publication year - 2007
Publication title -
journal of applied crystallography
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.429
H-Index - 162
ISSN - 1600-5767
DOI - 10.1107/s0021889807005122
Subject(s) - zigzag , crystallite , anisotropy , crystallography , crystal structure , group (periodic table) , symmetry (geometry) , materials science , chemistry , optics , geometry , mathematics , physics , organic chemistry
In this paper, the crystallographic relationships among all the NH 4 Cl crystallites in a zigzag aggregation pattern with local anisotropy, formed under low driving force, are analysed. It is found that all the crystallites in this aggregation are twinned with one another. The anisotropy of the zigzag pattern is controlled by the twin structure. The twin structure is of 6 mm symmetry. This twin structure is related to the crystal point group m 3 m , so it is proposed that all crystals with point group m 3 m (and even the similar point groups 432 and m 3) have the possibility to form this zigzag pattern. It is illustrated that the crystal symmetry plays an important role in the crystallite aggregation pattern.