The change in the lattice parameter of Cu nanopowders under the action of a pulsed electron beam

Abstract

The paper presents the results of the investigation of copper nanopowders obtained by the electric explosion method and the effect of pulsed electron irradiation on the parameters of the crystal lattice. By the method of small-angle X-ray diffraction, it is determined that the size distribution of nanoparticles is bimodal in nature with predominant particle sizes of 25 nm and 80 nm. Copper nanopowders were irradiated on a pulsed electron accelerator with an energy of 500 keV and a beam density of 60 A/cm2. The number of pulses varied from 1 to 50. The unirradiated and irradiated copper nanopowders were photographed on an X-ray diffractometer, and a comparative analysis of irradiated and nonirradiated nanopowders was made. All the reflections in the diffractograms were indicated and all phases in the nanopowders were determined. It is shown that upon irradiation reflection on the diffractograms shifts, depending on the dose, both to the left and to the right, explanations for this effect are given. By expanding the peaks in the diffractograms, the crystallite sizes and the dependence of the dimensions on the number of pulses of the electron beam were determined. It is shown that a radiative crushing occurs at all doses.