In the temperature range 1400 - 1600 ° C, the deformation of polycrystalline oxide ceramics occurs due to the action of diffusion mechanisms. The course of the deformation curves is very sensitive to the presence of nonequilibrium defects and stress concentrators, which were "hardened" during the cooling process after high-temperature firing during the preparation of materials. Destruction occurs, apparently, as a result of the formation of vacancies in areas of the stretched zone, confined to the boundaries of the crystals, and then their coagulation at the boundaries. The course of the processes of formation and development of cracks is not the same for different materials and depends on their crystal chemical characteristics.
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