The real structure and the mechanical properties of pure and doped corundum single crystals have been investigated. The single crystals were obtained by the Verneuil‐method. The results allow to propose two different models concerning the influence of the chromium and titanium oxide on the properties of corundum single crystals. Optimum concentration of the chromium oxide impurities was approximately determined, from which corundum single crystals with higher hardness can be obtained. It was stated that titanium oxide impurities with some concentrations made the crystals more fragile without plastically changes in the region of the individual mosaic blocks.
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Gościńska et al. (1979) studied this question.
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