Abstract
In this paper, the electron backscatter diffraction (EBSD) technique is used to determine the orientations of α-cristobalite dendrites. The two branches of the cross-shaped α-cristobalite dendrite extend along the crystallographic directions [100] and [010], but no branches develop along 〈001〉. A new kind of twinning relationship is found between two α-cristobalite dendrites. The twin axes are [110], [111] and [\bar 1\bar 11], and the twin planes are (111) and (\bar 1\bar 11). It is shown that crystallographic symmetry controls the dendrite morphology and dendrite aggregation.
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