Structure Images of a Nickel Fine-Particle Catalyst and Analysis of a Moiré Pattern

Conventional HR-TEM was applied to a nickel fine-particle catalyst that had been prepared by means of a gas-evaporation method. A structure image of the nickel fine particle showed that the particle consisted of an fcc nickel crystal and thin oxide layers of the surfaces. A platinum-deposited nickel fine particle exhibited a moire pattern, which was analyzed by the use of the Cowley-Moodie dynamical theory of diffraction. An accurate solution of the equations showed that a platinum lattice obliquely piled on a surface lattice of the particle.