负离子配位多面体生长基元与枝蔓晶的形成

Formation of Dendrite Growth Related with the Growth Units of Anion Coordination Polyhedra

本文运用负离子配位多面体生长基元理论模型讨论了KNbO3 ,β SiO2 和雪花枝蔓晶的形成机理 ,提出了枝蔓晶的结晶形态和对称性与晶体中的负离子配位多面体相互联结时的稳定方面密切相关。枝蔓晶是在远离晶体生长平衡态的条件下 ,以负离子配位多面体为生长基元 ,相互按照最稳定的联结方位延伸的。

The mechanism of formation of dendrite patterns during the crystal growth of KNbO 3,β-SiO 2 and snow was studied on the basis of the model of the growth units of anion coordination polyhedra.It is put forward that the morphology and symmetry of dendrite patterns was still dominated by the stability of connection orientation between the anion coordination polyhedra during the surface reaction, even they are in the state far from equilibrium. During dendrite growth, the anion coordination polyhedra as growth units are connected with the structure units on the crystal surface along the direction of stable combination.