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The morphology and defect characteristics of vertically pulled MgAl2O4 single crystals

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Abstract

Optical, etch pit and X-ray topographic studies of magnesium aluminate spinel (MgAl2O4) have shown that undoped single crystals vertically pulled from stoichiometric melts can exhibit a high degree of crystalline perfection. The principal defect is strain arising from the formation of {111} facets on the solid/liquid interface. This effect is inhibited by suitable control of interface shape, but is greatly enhanced by the presence of chromium which segregates non-uniformly between the facets and the bulk of the crystal. Chromium also causes strain in the impurity-rich bands corresponding to growth striations.

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Authors and Affiliations

  1. Royal Radar Research Establishment, Malvern, Worcs, UK

    B. Cockayne, M. Chesswas, P. J. Born & J. D. Filby

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  1. B. Cockayne
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  2. M. Chesswas
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  3. P. J. Born
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  4. J. D. Filby
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Cockayne, B., Chesswas, M., Born, P.J. et al. The morphology and defect characteristics of vertically pulled MgAl2O4 single crystals. J Mater Sci 4, 236–241 (1969). https://doi.org/10.1007/BF00549923

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