Moritz, Wolfgang and Wolf, D.
Züchtung von orientierten lithiumflourid-einkristallen aus der dampfphase.
In: Journal of Crystal Growth, Vol. 7, No. 2: pp. 227-230
A high vacuum oven was constructed to grow LiF single crystals from the vapor phase by the vertical pulling method. Using a special crucible top it is possible to grow oriented single crystals of 23 mm diameter and 70 mm length. At a temperature of about 150 °C above the melting point the maximum pulling rate was found to be 8 mm/h. The purification effect of the sublimation was investigated for Na+-, K+-, Ca++-ions and it was found that the concentration of these impurities is of the order of 10-6, except for sodium for which the purification is much less effective.