New Experimental Findings in Two-Dimensional Dendritic Crystal Growth

Tip-stable, tip-oscillating, and tip-splitting types of dendrites were observed experimentally in a two-dimensional supersaturated N${\mathrm{H}}_4$Cl solution. The relation between the tip velocity $V$ and the tip curvature $K$ were measured for the tip-stable type. It was found that $V$ is proportional to $K$ instead of $K^2$ which is expected from the marginal-stability hypothesis in a two-dimensional melt-growth system.