On Some Factors Having An Effect On Heat Exchange And Stability
Of The Process Of Automated Pulling From Melt Of Alkali Halide Crystals
Author(s)
B.G. Zaslavsky, O.D. Kolotiy, LI. Kisyl, V.S. Suzdal, V.V. Lyakhov
Abstract
On some factors having an effect on heat
exchange and stability of the process of
automated pulling from melt of alkali halide
crystals
B.G.Zaslavsky, O.D.Kolotiy, LI.Kisyl, V.S.Suzdal, V.V.Lyakhov
Institute for Single Crystals, Ukraine
Abstract
Isotherms in CsI(Tl) crystals were calculated for the case of automated pulling of
the latter from melt in cylindrical and conical crucibles. For the conical crucible
the crystallization isotherm has a more convex form towards the melt. This is
explained by higher temperature gradients and intensive heat removal from the
lower part of the growing crystal, this part being very close to the crystallization
front. The conical crucible promotes increase of thermal stability of the pulling
process. The calculation results were confirmed experimentally. Application of
the conical crucible allowed to automate the stage of radial growth and to
increase the pulling rate for large crystals to 5.5 mm/h even at a replenishment
with fine cr
Keywords
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