Lattice Parameters of Fine Copper and Silver Particles

Abstract

From an analysis of X-ray diffraction lines of fine Cu and Ag particles covered with thin oxide surface layers, the dependence of the lattice parameters on particle size in the core of the particles was determined. The lattice parameter particularly in fine Ag particles increases with decreasing particle size when the diameter is under 150 A. This experimental result can be interpreted in terms of the competition between the lattice softening and the surface tension in the ultrafine particles.