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Prof. Dr.-Ing. Hans. J. Scheel Crystal Growth Technology - Crystal Growth - ACRT

Crystal Growth


sound movie
In this movie Dr.-Ing. Hans J. Scheel talks about:
required stirring in growth from (high-temperature) solutions and in vertical Bridgman/VGF growth, and gives an introduction to the following historical ACRT movie.

Introduction to ACRT at Zurich IBM Research Laboratory

sound movie
This is the historical movie about:
“The Accelerated Crucible Rotation Technique (ACRT)”
from Zurich IBM Research Laboratory

Stirring or forced convection in crystal growth from solutions allows to homogenize the solution and thus nucleation control, and to reduce the diffusion-boundary layer for increased maximum stable growth rates for inclusion-free crystals. Well-mixed solutions in combination with very precise temperature control also allows to grow striation-free crystals of solid solutions, see movie about striations.
ACRT in vertical Bridgman and VGF growth leads to flat growth interfaces, to increased structural perfection and homogeneity, and therefore to improved (CdHg)Te and III-V solid solution crystals for high-performance devices.


1. Book: “Crystal Growth from High-Temperature Solutions”, 10 chapters, 634 pages, authors D. Elwell and H. J. Scheel, Academic Press, London - New York, (1975).
With additional chapter 11 “Crystal Growth and Liquid Phase Epitaxy of High-Tc Superconductors (HTSC)” and Appendices A. “Growth of Striation-free Crystals” and B. “Epitaxy and the Importance of LPE” , available as download on this website.
H. J. Scheel and H. Müller-Krumbhaar : “Crystal Pulling Using ACRT”, J. Crystal Growth 49 (1980) No. 2, p. 291-296.
I. H. Brunskill, R. Boutellier, W. Depmeier, H. J. Scheel, and H. Schmid “High-Temperature Solution Growth of Pb(Fe0.5Nb0.5)O3 and Pb(Mn0.5Nb0.5)O3 Crystals”, J. Crystal Growth 56 (1982) p. 541-546.
H. J. Scheel and E. 0. Schulz-DuBois : “The Role of Hydrodynamics in Crystal Growth from High-Temperature Solutions”, Chapter 3.1.4 in “Convective Transport and Instability Phenomena”, Editors J. Zierep and H. Oertel Jr., Braun Verlag, Karlsruhe (1982), p. 491-513.
H.J. Scheel, “Developments in Crystal Growth from High-Temperature Solutions”, Progress in Crystal Growth and Characterization 5 (1982) p. 277-290.
P. H. O. Rappl, L. F. Matteo Ferraz, M.R.X. Barros, D. Schiel, and H. J. Scheel: “Hydrodynamic Simulation of Forced Convection in Czochralski Melts”, J. Crystal Growth 70 (1984) p. 49-55.
H. J. Scheel, “The Accelerated Crucible Rotation Technique” in the series “Milestones in Crystal Growth”, American Association for Crystal Growth Newsletter 15 (1985) No. 3, p. 2-3 and cover photographs.