heterogeneous nucleation
Quick Summary
Heterogeneous nucleation is a fundamental process in crystallography, marking the initial stage of crystal formation. It occurs when a small cluster of particles, such as ions, atoms, or molecules, arranges itself into a pattern characteristic of a crystalline solid. This initial cluster, or nucleus, then serves as a site for further particle deposition as the crystal grows.
In heterogeneous nucleation, this process is facilitated by the surface of a different substance, like a dust particle or the wall of a container. This foreign surface acts as a template, guiding the orientation of incoming particles. While less common than heterogeneous nucleation, homogeneous nucleation can occur when particles randomly align within the bulk medium. Heterogeneous nucleation is generally more prevalent, though homogeneous nucleation becomes more likely under conditions of extreme supersaturation or supercooling.12
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