Synthesis, structure, and luminescence properties of Cd1–xMgxTe (0 < x < 0.20) solid solutions

Resumo

We have synthesized CdTe–MgTe samples in the composition range 0–30 mol % MgTe. The composition dependence of the unit-cell parameter of the Cd_1–xM_xTe solid solutions has been obtained for the first time. The lattice parameter of cadmium telluride (sphalerite structure) has been shown to decrease almost linearly in the range 0 ≤ x ≤ 0.20. The 78-K cathodoluminescence spectra of the Cd_1–xMg_xTe (0 < x ≤ 0.15) solid solutions heat-treated under vacuum in order to remove the excess tellurium contain strong lines in the edge emission region, due to a transition from the conduction band to a shallow acceptor level.