Unstable states of BGaN(P, As) / Ga(P, As) materials

The spinodal decomposition ranges of low N-content B_xGa_1-xN_y (P,As)_1-y/Ga(P,As) alloys grown on Ga(P,As) (001) substrates, are described. The alloys are represented as strictly regular solutions. In the analysis, we take into account the transformation of the bonds, strain and elastic energies. Spinodal decomposition ranges of B_xGa_1-xN_yP_1-y alloys with compositions x = 0.01, 0.013, 0.015 and 0 ≤ y ≤ 0.08 are demonstrated up to 1100°C, and to B_xGa_1-xN_yAs_1-y with compositions x = 0.008, 0.01, 0.011, 0.012 and 0 ≤ y ≤ 0.06 are demonstrated up to 1180°C. The estimations show that the decomposition ranges are larger when the transformation of the bonds is not considered.