Abstract
The solid–liquid interface motion of NaBi(WO4)2 (NBWO) meltcrystal growth is observed in an in situ system, in which the wholeprocesses of interface transition from flat interface and cellular todendrite are visualized. The spacing of the dendrite under smallertemperature gradient turns out to be larger than that under largertemperature gradient, which is found to be sensitive to the temperaturedistribution. The mechanism of dendrite growth of NBWO is studied basedon the model of the growth units of anion coordination polyhedra. The{ 001} face has two apex links, so it shows higher stability and hashigh growth rate and forms the arm of dendrite, whereas the { 010} facehas only one apex link, and thus shows relative slower growth rate andfirstly forms the branches.
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