Chemical vapor transport for the control of composition of low-volatile solids: II. The composition control of indium sulfides: Technique of the charge dilution

Considering chalcogenide transport processes with a participation of indium and indium sulfides in the closed system it was found that non-isothermal conditions are insufficient for a noticeable reversible indium transfer. The main reason for this fact was considered as a deficiency of indium halides with a high oxidation degree of indium which are in the equilibrium in the vapor with condensed indium or its lower sulfides. To provide chemical transport that is impossible in the usual experimental conditions a new way was proposed and applied implying dilution of a charge (source or getter of indium) with inactive diluent. One of the probable diluents is gold. The probability of reversible and selective chemical transport was proved for indium in the system “indium sulfides – vapor of In chlorides – (Au–In) charge”. Conditions for performing the non-destructive composition control of indium sulfides in the non-destructive chemical transport were determined.