Ultrafine Metal Particles Formed by Gas-Evaporation Technique. II. Crystal Habits of Magnesium, Manganese, Beryllium and Tellurium

Abstract

Particle samples collected at various positions in metal smokes were studied by electron microscopy. The size and shape of the particles varied with the collection positions as well as with the evaporation conditions such as the gas pressure and evaporation temperature. The results showed a general trend that the crystallites with larger surface area formed in the outer zone while those with smaller surface area formed in the inner zone, provided that their volume was the same: hexagonal plates (Mg & Be) and rods (Mn & Te) formed in the outer zone while hexagonal polyhedra (Mg), rhombic dodecahedra (Be & Mn) and pear-shapes (Te) formed in the inner zone.