INTERPLANAR DISTANCES IN DEFORMED DIAMOND

This paper presents the findings of a study of the structure of diamond particles generated from the fracture of a diamond plate produced through the high-pressure high-temperature (HPHT) method of growth. The studies were conducted using high-resolution transmission electron microscopy techniques. It was determined that during the process of diamond fracture, a partial transformation of its crystal structure into graphite occurs along the conventional path. This transformation is accompanied by an increase in the interplanar distances d111. A broad spectrum of interplanar distances ranging from 0.206 nm to 0.280 nm has been observed. Additionally, the analysis revealed the presence of mosaic structures composed of fragments with disoriented crystal lattices. These structures are believed to be formed during the late stages of fracture. The diffraction patterns that correspond to these samples demonstrate the blurring of ideal diffraction reflexes and the formation of streaks. The results show that the plastic deformation of diamond is associated with the breakage of sp³-bonds, the appearance of internal cracks, as well as partial amorphisation and the formation of mosaic structures. Amorphisation manifests itself in the form of bands with a broken structure, while mosaicism is associated with inhomogeneous deformation and distortion of lattice planes. An important feature of diamond fracture is the formation of mosaic structures that are not characteristic of mechanically processed particles. The data obtained allow a deeper understanding of the mechanisms of diamond fracture under extreme conditions, which is important for creating new chemical technologies for processing diamond materials and predicting their behavior in complex external conditions. The results can be useful for the development of technologies for the formation of diamond materials and analyzing structural changes under extreme conditions. For citation: Kulnitskiy B.A., Gordeeva T.A., Blank V.D. Interplanar distances in deformed diamond. ChemChemTech [Izv. Vyssh. Uchebn. Zaved. Khim. Khim. Tekhnol.]. 2025. V. 68. N 9. P. 14-19. DOI: 10.6060/ivkkt.20256809.4y.