Abstract
The T vs composition phase diagram of the alloy system Cd2xCuGa)yMn2xTe2 (x + y + z = 1) was investigated in the range 0 < z < 0.8 by differential thermal analysis and X-ray diffraction measurements. Samples were prepared for various lines of constant x/y ratio and the T(z) data were determined for each line. X-ray powder photographs were used to determine equilibrium conditions, to give lattice parameter values, and to determine the limits of single-phase solid solution. In addition to the various phase field boundaries, the zinc-blend-chalcopyrite and Mn-ordered-Mn-disordered transition lines were determined, these fields being the ones of interest in the measurements of optical energy gap and magnetic properties. Room-temperature values of the optical energy gap Eo were determined for all of the single-phase samples and the variations of Eo with z were investigated.
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