Abstract
AbstractX‐ray powder diffraction, differential thermal analysis, and magnetic susceptibility measurements on polycrystalline samples are used to determine the details of the T(z) phase diagram of the alloy system Cu2(1−z)MnzGa2Se4. At high temperatures, there is a single phase solid solution across the complete diagram in a disordered zincblende phase. However, at lower temperatures, the singlephase range is limited to relatively wide terminal fields, which are ordered structures based on a zincblende subcell. Several different ordered phases are found to occur and the values of the Curie‐Weiss constant θ are used to investigate the changes in ordering with composition. It is shown that these ordering changes cause discontinuous changes in the slope of the graphs against composition of the lattice parameters, optical energy gap, and Néel temperature values.
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