Abstract
Abstract The crossing ranges of the twin layers, formed in lithium niobate (LiNbO3) single crystals under uniaxial loading with constant deformation rate (from 5 to 30 μm min−1) in the temperature range from 450 to 850°C are investigated, using optical methods. Crystallographic analysis of possible twin crossings was carried out in a pseudo-cubic system to check on the mechanical joining (compatibility) of these crossings. It has been shown that, among the four possible types of crossings of different types of layers (LiNbO3 has two conjugated twinning systems), only one type can lead to a coherent crossing. In the last case, according to the considered pseudo-cubic model, in structural domains separated by this type of crossing, all four different orientation states are realized. The other three types of crossing are not coherent, and they result in crack formation.
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