Abstract
High-purity tellurium is used in the preparation of II–VI compounds, particularly CdTe and Cdx Hg1−x Te. Distillation of tellurium under low-pressure H2 reduces the concentrations of iron and silicon. The addition of CdTe to tellurium prior to zone refining, in a quantity less than the eutectic concentration, has been observed to change the segregation behavior of Ca, K, Ga and As, which enables more efficient refining. Emission spectroscopy, spark source mass spectroscopy and the evaluation of Cd0.21Hg0.79 Te have been used to characterize these effects.
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