Abstract
Fine particles of iron sulfides were prepared by means of evaporation in argon gas in the pressure range of 5 to 100 Torr in order to study the early stages of growth. Bright and dark field transmission electron microscopy images and scanning micro diffraction patterns show: (i) The iron sulfide particles grow in chains of three types, which are commonly observed to form far from the evaporation source through the experiments with different argon gas pressures. One of the chains is composed of hollow particles, which are characterized by two parts of a hollow core and polycrystalline crust. The second chain is composed of well defined particles which have some facets and edges indicating hexagonal symmetry. The third chain is composed of particles which exhibit the characteristics shape of an octopus-pot. The hollow particles were mainly prepared in the lower argon pressure range (5, 35 Torr), while the other two types of particle whose size increased with the argon pressure were grown in the higher pressure range up to 100 Torr. It was found that the respective particles were coalesced into one long chain by the ferrimagnetic interaction between the particles. (ii) Some film-like products were also observed in the immediate vicinity of the evaporation source.
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