We have described a spinodal decomposition range of the low N-content Al x Ga 1Ϫx N y As 1Ϫy alloys grown on GaAs͑001͒. In our analysis we take into account transformations of the bonds and strain, coherency strain, and elastic energies. The alloys are considered in the simple solution approximation. The strain energy is presented by the interaction parameters between the compounds estimated in the valence-force field model. The spinodal decomposition range of Al x Ga 1Ϫx N y As 1Ϫy alloys with compositions 0рxр0.4, yϭ0.01, 0.02, 0.03, 0.04, and 0.05 are demonstrated up to 1000°C. It is shown that Al and N increase dramatically the temperature of the phase separation.
Self-assembling of 1O4Mg tetrahedral clusters in ZnTe isoelectronically co-doped with Mg and oxygen in the ultra dilute oxygen impurity limit is described by a phase diagram. The occurrence of 1O4Mg clusters is a result of the second-order transition. The final stage of self-assembling when all oxygen impurities are in 1O4Mg clusters has to be reached also as a result of the second-order transition at the temperature close to the temperature of the occurrence of these clusters. The conditions of these phase transitions are obtained.
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