Abstract
For the purpose of preparing ruby single crystals with a high degree of structural perfection, the evolution of their structural state is investigated using four-point loading at T=1490°C and chemical etching pits. The starting stress τst for the onset of the dislocation motion is measured. The regularities of the arrangement of dislocations in single-crystal samples of ruby are established. The starting stress for the onset of the dislocation motion is found to be τst=2 MPa. The results obtained make it possible to determine the optimum parameters of thermomechanical treatment of the single crystals and, in the future, to solve the problem of their longterm serviceability.
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