Preparation of high resistivity antimony selenide by zone refining

A two-step zone refining process to obtain high resistivity Sb₂Se₃ ($\text{? > 10}{}^7\text{Ω}\text{cm}$) with a good yield is described. It is shown how the deviations from the stoichiometry may be conveniently controlled by measurements of the electrical resistivity and by differential thermoanalysis.