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Theoretical and experimental studies of the CdCr2S,(HgCr2Se,) : CrC1, systems have been performed for the crystal composition control in the chemical transport growth. The balance partial pressures of the components have been calculated in a wide temperature range. It is shown that the CdCr,S, composition control can take place with the powerful change of the transport agent quantity. Such control for the HgCr,Se,: CrC1, system is more difficult. The calculated vapour phase composition is in good agreement with the determined one based on the measurements of the sound speed and transport rate.

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