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An interface stability model is proposed for crystal growth by physical vapour transport (PVT) in semiopen (SO) systems, which is based on the constitutional supercooling criterium. The model, whose main feature is the relaxation of the local eqilibriurn assumption at the growing interface, proved suitable for explaining the remarkable growth stability in SO systems when applied to urea growth. A semiempirical approach for estimating the pressure inside a SO-system and the kinetic contributions to stability is also proposed, which allows for quantitative comparison of model and experimental results

Growth Stability in Semiopen Physical Vapour Transport