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X-ray powder diffraction, differential thermal analysis and magnetic susceptibility measurements on polycrystalline samples were used to determine the details of the T(z) phase diagram of the alloy system Cu2(1 − z)Mnzln2Se4. At room temperature, the terminal solid solutions extend over the ranges 0 200 °C, the Mn is randomly distributed over the cation sublattice, the phase having space group 142d. However, at lower temperatures, for 0.05 < z < 0.30, the Mn atoms order to occupy only the 4a sites resulting in probable antiferromagnetic behaviour. The high z alloys all show a random distribution of Mn on the cation sties, and the compound Mnln2Se4 (z = 1.0) was found to be spinglass, with Tg = 2.7 K and θ = −94 K. |
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