THE SYNTHESIS AND STRUCTURE OF ULTRADISPERSED SILICON POWDERS

Silicon clusters of nanoscale sizes (10-100 nm) were produced in a sil ane jet under conditions of gas-phase CO2-laser synthesis. The composi tion, the sizes of particles, and the size variance of silicon powders have been investigated by means of scanning electron microscopy for d ifferent parameters of synthesis. The method of X-ray diffraction anal ysis has been applied to investigate the morphology of nanoclusters co nsisting of a crystalline core and an amorphous shell. Conditions for obtaining nanoparticles of required sizes and dispersion with a variab le ratio of crystalline and amorphous components are determined.