MORPHOLOGY AND DEFECT CHARACTERISTICS OF VERTICALLY PULLED MGAL2O4 SINGLE CRYSTALS

被引:19
作者
COCKAYNE, B
CHESSWAS, M
BORN, PJ
FILBY, JD
机构
[1] Royal Radar Research Establishment, Malvern, Worcs
关键词
D O I
10.1007/BF00549923
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
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. © 1969 Chapman and Hall.
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页码:236 / &
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