Crystallography characteristic of fine particles prepared by the gas evaporation technique is described. The crystal habits observed for fcc and bcc metals, truncated octahedron and truncated rhombic dodecahedron, respectively, are explained by a requirement of the surface energy minimum, that is, Wulff polyhedron. Characteristic crystal structures caused by the small size for fcc and bcc metals are shown as multiply twinned particles and A15 structure, respectively. Multiply twinned particles observed for Wurzite type of structure such as GaN, AIN, CdS are also mentionned. Finally, crystal structures and habits of fine particles accompanying the phase transformation during the growth are described for Ti, Be, Fe and Mn particles.
