Abstract
A new technique has been developed for growing large and very pure single crystals of high melting flourides from the vapour. As an example the growth of MgF 2 crystals is described: sublimation takes place at 1320°C; the melting point is at 1265°C; hence ΔT = 1320−1265 = 55°C. The length of the crystals is 30mm, the diameter is 10 mm. Some properties of the vapour-grown MgF 2 crystals such as transparence, colour centre formation by X-raying and etching behaviour are compared with those of melt-grown MgF 2 crystals. It is found that the number of lattice defects in vapour-grown MgF 2 crystals is much smaller than that in the melt-grown crystals.
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