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GaSb growths were performed in a vertical Bridgman arrangement to clarify the role of the radial heat loss, as the source of the radial component of thermal elastic stresses, in the formation of dislocations. Using identical ingot shapes, the variation of growth conditions — including a space experiment — has proved that correct isolation of the ampoule wall from the convection currents of the furnace can considerably decrease the dislocation density. It is concluded that the existence of radial stresses in the growing ingot has to be taken into account in both the theoretical calculations and the development of crystal growing methods. |
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