Detached growth behaviour of 2-in germanium crystals
作者： O. Pätzold , K. Jenkner , S. Scholz , A. Cröll
DOI: 10.1016/J.JCRYSGRO.2004.12.163
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摘要: Abstract A modified vertical gradient freeze (VGF) process is applied to grow germanium single crystals with a diameter of 2 in without contact the crucible. Several methods thermal pressure control obtain detachment crystal from wall are described. The detached-grown parts characterised focus on deflection solid–liquid interface. In comparison an attached-grown reference crystal, pronounced decrease interface found. This effect ascribed reduced radial temperature solidification under detached conditions which, in turn, associated lower shear stress at Numerical results v.Mises-stress confirm this explanation.
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