Abstract
The structure of silicon, along with mixtures of silicon and boron carbide (B4C) powders and silicon and diamond powders with different proportions after mechanoactivation, has been studied by transmission electron microscopy (TEM) methods. It was shown that silicon and boron carbide experience twinning according to the known twinning mechanisms. In addition to the initial phase with a diamond lattice, the particles of two other phases were detected for silicon, including: the Kasper phase (SiIII) and lonsdaleite (SiIV). We established that the phase transformations in silicon can happen due to different mechanisms.
Highlights
The treatment of the powders of various materials by ball milling (BM) is widely used to produce nano-structured materials
The silicon powder after treatment was analyzed by the transmission electron microscopy (TEM) method
Twins were only formed after the 2-h treatment
Summary
The treatment of the powders of various materials by ball milling (BM) is widely used to produce nano-structured materials. The BM treatment is similar to the shock-wave treatment method Both of these methods are used to obtain high-hardness carbides, borides and nitrides, with the aim of changing their structural state. Nanostructured silicon is a promising material due to its unique properties. The mechanical properties of the material strongly depend on the presence of defects [6]. The structure and properties of silicon depend on the mechanoactivation conditions and deformation medium. The modification of silicon by the nano-inclusions of the second phase (SiC, C60 and B4 C) leads to a slight change in the Seebeck coefficient but there is a 3-fold increase in the conductivity of the material [7]. We treated both pure silicon and mixtures of silicon with boron carbide and diamond powder
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