We discuss a proposed morphology-selection principle and the implied concepts of the morphology diagram and morphology transitions. We use a diffusion transition scheme to demonstrate that morphology transitions can be characterized by a change in the functional form of the growth velocities and a change in the envelope shapes. Our main support of the present picture is the demonstration of the coexistence of two morphologies, tip splitting and dendritic growth.

• Received 7 July 1993

DOI:https://doi.org/10.1103/PhysRevE.48.R4168