High-energy ball milling of nonstoichiometric compounds
A.I. Gusev Institute of Solid State Chemistry, Urals Branch of the Russian Academy of Sciences, ul. Pervomayskaya 91, Ekaterinburg, 620219, Russian Federation
The preparation of nanocrystalline powders of nonstoichiometric compounds such as carbides and oxides by high-energy milling is considered. The modern state of the milling models for nonstoichiometric compounds is described. The influence of nonstoichiometry on the particle size of the produced nanopowders is discussed. The model dependences of the size D of nanopowder particles on the duration of milling and the composition of nonstoichio-metric compounds are compared with the literature experimental results on the milling of nonstoichiometric carbides and oxides. The diffraction methods for the certification of na-nopowders according to the size of the nanoparticles, the magnitude of microstrains and the uniformity of the microstructure are considered in detail. The importance of taking into account the anisotropy of microstrains in milled nanopowders is shown.