Abstract
Polycrystalline samples of Zn2x(CuIn)yMn2zTe2 and Zn2x(AgIn)yMn2zTe2 alloys were prepared by a melt and anneal technique. X-ray power photographs were used to determine equilibrium conditions and lattice parameter values (a and c). In each system, four single-phase fields are found to exist, two with normal zincblende and chalcopyrite structures and two derived from chalcopyrite and zincblende structures in which the Mn atoms show crystallographic ordering on the cation sublattice. In the Zn2x(AgIn)yMn2zTe2 case, a two-phase (zincblende plus chalcopyrite) field was observed. Optical absorption measurements were carried out to give values of the room temperature optical energy gap E0 for all single-phase samples. While E0 varied linearly with composition inside a phase field, the resulting lines had different aiming points at z=1.0. These values of E0, which are characteristic of the structure, give a good indication of the position of the phase boundaries. Extrapolation to z=0 gave E0 values of the compounds in the zincblende structure, these being approximately 0.70 eV for CuInTe2 and approximately 0.75 eV for AgInTe2.
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