Abstract

Observation of selected low-symmetry crystals growing in the dendritic morphology indicates the importance of crystal structure in determining not only the sidebranch spacing but also the very existence of sidebranching. This evidence provides a perspective which supplements the view of sidebranching as being governed by the continuum dynamics of a moving solid-liquid interface. Direct evidence is presented for a parabolic diffusion field surrounding growing dendrite tips. The existence of this field is consistent with the theoretical analysis which leads to the needle-crystal model of dendritic growth.

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