Abstract
The reduction of Te(IV) at tungsten electrodes in basic and neutral KCl−AlCl 3 melts has been studied in the temperature range from 300 to 400°C using cyclic voltammetry and differential pulse polarography. In basic melts Te(IV), present as TeCl 6 2− and TeCl 5 − , is reduced to soluble Te(II) species, which can be further reduced to elementary tellurium insoluble in tungsten. The divalent species are stabilized by increasing the temperature. From the pCl − dependence of the reduction process, Te(II) in basic melts is suggested to be present as TeCl 3 − and TeCl 2 . In neutral melts a third oxidation state (possibly monovalent tellurium) is formed when Te(II) is reduced.
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