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A modified flame fusion process has been developed to grow crystals at low cost for use as substrate for the ESFI® SOS technology. Mg‐Al spinel and sapphire single crystals with diameters up to 50 mm have been grown. Differences between both kinds of crystals are described concerning the behavior during the widening phase and the cooling phase of the growth process. Crystalline perfection was investigated in both crystals by the x‐ray topography.

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