Abstract

Pattern formation during directional solidification from the melt is observed by optical methods. The investigations are made in the KCl-CsCl and the PbCl 2-PbBr 2 systems. The melting temperatures of the chosen compositions are approximately 750 and 430°C, respectively. A detailed description of the experimental set-up is given. The results in the system of 95 mol% KCl + 5 mol % CsCl show that the relation between the primary dendrite spacing D and the growth velocity v is given by D α v −0.42 ; the relation between the tip radius and the growth velocity is R α v −0.53.

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