Electron microscope investigation of crystals based on bend-contour arrangement iii. formation of subgrain boundaries in dislocation-free crystals of selenium

Abstract

Bend‐contour pattern analysis is used to study processes occurring in initially dislocation‐free selenium crystals during the formation of subgrain boundaries in the course of crystal growth. Using the data obtained on the magnitude and character of lattice disorientations in various types of emerging boundaries, a block‐formation model is proposed. The model is based on the possible modes of relaxation of the crystal lattice elastic bending, inherent in crystals growing in an amorphous film.

Phenomenon of relaxation of inhomogeneous elastic rotational curvature of the lattice of nanofine spatial dissipative structures of hexagonal selenium

“…It is known that the formation of interblock boundaries take place with varying module of the misorientation vector  in NRSDS of hexagonal seleniumnanofine crystals after the stage of quenching of NRSDS's [1][2][3][4]. This phenomenon is the result of relaxation of an inhomogeneous elastic rotational curvature of the lattice around [001] in one of NRSDS block [5][6][7][8][9]. At the same time, it is known that the formation of interblock boundaries in NRSDS, along which not only the modulus but also the sign of the misorientation vector changes, is a result of relaxation of the inhomogeneous elastic rotational curvature of the lattice around [001] in neighboring blocks of NRSDS [8,9].…”

“…At the same time, it is known that the formation of interblock boundaries in NRSDS, along which not only the modulus but also the sign of the misorientation vector changes, is a result of relaxation of the inhomogeneous elastic rotational curvature of the lattice around [001] in neighboring blocks of NRSDS [8,9]. The driving force of relaxation processes in NRSDS's of hexagonal selenium, leading to the formation of interblock boundaries with a crystalgeometric parameters varying along the boundaries, is the tendency to decrease the energy of the inhomogeneous elastic rotational curvature of their lattice around [001] [5][6][7]. The relaxation process of the inhomogeneous elastic rotational curvature of the lattice of NRSDS around [001], which determine the formation of the interblock torsion boundaries, are realized only in the part of NRSDS's of hexagonal selenium [5][6][7][8][9].…”

“…The driving force of relaxation processes in NRSDS's of hexagonal selenium, leading to the formation of interblock boundaries with a crystalgeometric parameters varying along the boundaries, is the tendency to decrease the energy of the inhomogeneous elastic rotational curvature of their lattice around [001] [5][6][7]. The relaxation process of the inhomogeneous elastic rotational curvature of the lattice of NRSDS around [001], which determine the formation of the interblock torsion boundaries, are realized only in the part of NRSDS's of hexagonal selenium [5][6][7][8][9].…”