Critical size of crystals growing under diffusion conditions for loss of polyhedral stability

A new expression is proposed for calculating the critical size for which, when reached, the polyhedral stability of a crystal growing under diffusion controlled mass transfer disappears. The well-known relationships for critical size are obtained as special cases of the proposed expression, for infinitely dilute solutions. In addition, it is shown that when the solubility increases, the critical size of the crystal must also increase, all other parameters remaining identical. Similar is the dependence of the critical size on the concentration.