J. Phys. IV France 05 (1995) C5-1053-C5-1060
Growth Stability in Semiopen Physical Vapour TransportC. Paorici1, M. Zha2, L. Zanotti2, L. Carotenuto3 and T. Tiberti3
1 Physics Dept., Univ. of Parma, 43100 Parma, Italy
2 MASPEC-CNR Institute, 43100 Parma, Italy
3 MARS-Center, 80125 Naples, Italy
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.
© EDP Sciences 1995