INTERPLANAR DISTANCES IN DIAMOND DEFORMED AS A RESULT OF MECHANOCHEMICAL TREATMENT

Deformation processes in materials affect structure and properties, so they are of interest to researchers. High-resolution transmission electron microscopy and X-ray analysis techniques are used to study deformation in crystalline materials. In this work, diamond particles with sizes ranging from 2 to 15 nm processed in a planetary mill were studied. Analysis of the structure showed a change in the interplanar distances in the particles: the d111 = 0.206 nm characteristic of diamond increased to 0.220 nm. Such lattice expansion is not characteristic of point defects and can be associated only with the breaking of interatomic bonds. The study aims to investigate the deformation mechanisms of diamond under high mechanical stresses, which has implications for potential applications. Carbon-based materials such as diamond have high strength and hardness due to covalent bonds. At temperatures below the Debye temperature diamond is almost immune to dislocation plasticity, making it one of the strongest materials. Plastic deformation of diamond can occur both under the influence of cyclic loading and under the influence of shear stresses, which opens up new prospects for its use in various fields of science and technology. When diamond nanoparticles are processed in a planetary mill, a process of transition of a metastable phase (which diamond is) to a thermodynamically stable state - graphite - is observed. This transition occurs by accumulation of defects in the diamond structure, formation of twins, onions and deformation bands. All this testifies to the complex nature of plastic deformation in diamond. For citation: Gordeeva T.A., Kulnitskiy B.A., Ovsyannikov D.A., Popov M.Yu., Blank V.D. Interplanar distances in diamond deformed as a result of mechanochemical treatment. ChemChemTech [Izv. Vyssh. Uchebn. Zaved. Khim. Khim. Tekhnol.]. 2024. V. 67. N 10. P. 49-54. DOI: 10.6060/ivkkt.20246710.2y.