The evolution equations of crystal growth often employ a regularization of the surface energy based on a corner energy term. In this dissertation, we consider the effect of this regularization on the equilibrium shape of a solid particle in three dimensions. We determine that a sufficient regularization involves only one of the two isotropic invariants related to curvature. Using a long-wave approximation, we derive a nonlinear equation for the shape of a semi-infinite wedge in the case when the surface energy has cubic symmetry. An analytic description of the solution along an edge is given as well as an exact solution for a special case of anisotropy. Finally, this equation is solved numerically to demonstrate explicit solutions for which the regularization rounds the edges of the unregularized crystal shape.In particular, adding a dependence on curvature to the surface energy should penalize sharp edges and corners, and make them rounded on a small length scale (Herring(1951a)). Since a large curvature at the corner has high energyanbsp;...
|Title||:||Three-dimensional Equilibrium Crystal Shapes with Corner Energy Regularization|
|Publisher||:||ProQuest - 2008|