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Twin and topotactic growth of β‐eucryptite dendrites and their lattice coincidence analysed by the reticular theory
Author(s) -
Zhao ShanRong,
Xu HaiJun,
Liu Rong,
Wang QinYan,
Liu XianYu
Publication year - 2013
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/s0021889812047553
Subject(s) - crystal twinning , crystallography , macle , electron backscatter diffraction , perpendicular , materials science , condensed matter physics , diffraction , lattice (music) , reticular connective tissue , geometry , chemistry , optics , physics , microstructure , mathematics , anatomy , acoustics , medicine
Snowflake‐shaped dendrites of β‐eucryptite–β‐quartz solid solution were artificially crystallized in a matt glaze, and the crystallographic orientation of the dendrites was analysed by the electron backscatter diffraction (EBSD) technique. The six branches of a snowflake‐shaped dendrite in the plane (0001) are along 〈110〉. From the orientation determination, a twin relationship and a topotactic relationship between dendrites were found. The twin axes are [011], [] and [210], and the twin planes perpendicular to the twin axes are () and (). From the reticular theory of twinning, it was calculated that the twin index n = 2 and the obliquity ω = 3.2877°. The studied dendrite is a twin by reticular pseudomerohedry with low twin index and obliquity. In the topotactic growth, no twin elements have been found, but the three main crystallographic directions 〈001〉, 〈210〉 and 〈110〉 of the two dendritic crystals overlap each other. The degree of lattice coincidence between the two crystals in this topotactic growth is also discussed.