Abstract
The crystal growth of simple or mixed sulfides of the metals of the IB (Cu-Ag) and IIB (Zn-Cd-Hg) groups by thermal treatment in sulfuretted hydrogen atmosphere is studied by means of scanning electron microscope. The kinetics of the crystal growth varies very much from one group of sulfides to the other because of the large difference between their thermodynamic properties. The crystallisation is easy and fast for the sulfides of the metals of the IB group. It is slow and the crystals obtained are small for the sulfides of the metals of the IIB group. Mixed sulfides containing two IB metals or two IIB metals are reduced to the case of the simple sulfides whereas mixed sulfides containing both one IB metal and one IIB metal have a very particular behaviour. The physical factors which seem to take place directly in the crystal growth are investigated.
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