Abstract
An experimentally verified model of a block structure generation in basal-faceted sapphire ribbons is developed from three-dimensional thermoelastic stress computations and X-ray measurements. The reason for the typical block generation in the thin-faceted sapphire ribbons is a switching between the basal and the prismatic slip systems. The prism slip system acts only if the basal facet deviates from the ribbon side surface less than ∼3°. Dislocations generated by the prismatic slip are only able to create blocks typical for the basal-faceted ribbon. Since some faceted ribbon width, estimated as 5 mm, the prismatic slip does not act and the typical blocks do not generate. From computations supported by X-ray measurements a local increase of the thermoelastic stresses around bubbles was estimated as a factor of 2–2.5.
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