Abstract
Bimetallic particles of PdCu and PdCu3 are prepared by decomposition of orga- nometallic compounds on MgO micro-cubes. During the annealing between 350 and 400 °C, in reducing atmosphere, PdCu particles grow with the fcc structure, without defined shape. The particles epitaxially (001) oriented on MgO are dilated and accommodated to the substrate. After annealing at 450 ° C, the particles adopt the 03B2 ordered structure. The particles are limited at the edges by (100) and (110) faces. Most of them are oriented (001) on MgO with (110)PdCu ~ (100)MgO, which corresponds to a perfect accommodation of the lattices without deformation compared to the bulk, despite of the reduction in H2. The PdCu3 particles smaller than about 10 nm were found with the 03B1 ordered structure, without periodic anti-phase boundaries.
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