Abstract
Crystallographic characteristics of the Cu2MgSnSe4 quaternary compound and Cu2 – xMgSnSe4 (0 < x ≤ 0.15) copper-deficient solid solutions have been determined for the first time. It has been shown that the band peaking at 1.39 eV in the 78-K cathodoluminescence spectrum of Cu2MgSnSe4 is most likely due to CuMg and MgCu antisite defects resulting from exchange of atoms between the copper and magnesium sublattices in the kesterite structure and that the spectra of Cu2 – xMgSnSe4 contain, in addition to the 1.39-eV band, a band peaking at 1.34 eV, which is due to Cu2+ · VCu defect associates.
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