Abstract
The real structure of lanthanum hexaboride single crystals was investigated using transmission electron microscopy (thin foil) and diffraction methods. Two structural defects were found, flat segregations and dislocations, having Burgers vector b‖〈100〉. Most of the dislocations are arranged in {100} planes, which may be slide planes for a simple cubic structure, but the dislocation loop configuration showed that during single-crystal growth their movement is not characterized by slide but by diffusion creep. It is shown that the main sourse of dislocations arising during growth of single crystals is generation by flat segregation which according to diffraction investigations has a different structure from both lanthanum hexaboride and tetraboride.
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