Polymorphous Transition Wurtzite-Sphalerite for Nonstoichiometric Cadmium and Zinc Chalcogenides

摘要

Cadmium and zinc chalcogenides are widely used as active components in displays, radiation detectors 11, 21, visible and IR lasers. Non-stoichiome-try defects and polymorphous transitions in nonstoichiometric phases have significant effect on crystal and polycrystalline film technology for these materials. The analysis of the structure and thermodynamic features of phase equilibrium diagrams of cadmium and zinc chalcogenides demonstrated that there were obtained crystal and polycrystalline preparations with both wurtzite (P63mc) and sphalerite (F43m) structure for all binary phases except CdTe and ZnTe under normal pressure in the temperature range from the room temperature up to the maximum melting temperature. Herein for all compounds the sphalerite structure is stable at low temperatures while the wurtzite structure is stable at high temperatures.