It is established theoretically and experimentally that in certain temperature and composition ranges the solid solutions InGaAsP comprise a system of strained, alternating (in mutually perpendicular directions [100] and [010]) domains of a solid solution with two different compositions and different lattice constants. The domains are clearly seen at the surface of an epitaxial film and wash out into its depth in the direction of the substrate. The data obtained most likely show spinodal decomposition of InGaAsP solid solutions in the experimental samples.
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Vavilova et al. (1999) studied this question.
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