Microsc. Microanal. Microstruct.
Volume 8, Number 6, December 1997
|Page(s)||379 - 391|
Bimetallic PdCu and PdCu3 Particles Prepared by Wet Impregnation-HRTEM Study of the Structure and the Interface with the MgO SubstrateSuzanne Giorgio et Claude Henry
CRMC2 , CNRS, Campus de Luminy Case 913, 13288 Marseille Cedex 9, France
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 ordered structure. The particles are limited at the edges by (100) and (110) faces. Most of them are oriented (001) on MgO with PdCu||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 ordered structure, without periodic anti-phase boundaries.
8120G - Preparation of metals and alloys compacts, pseudoalloys.
8120E - Powder techniques, compaction and sintering.
6848 - Solid solid interfaces.
8140G - Other heat and thermomechanical treatments.
6480G - Microstructure.
annealing -- copper alloys -- interface structure -- magnesium compounds -- materials preparation -- palladium alloys -- powder metallurgy -- transmission electron microscopy -- bimetallic particles -- wet impregnation -- HRTEM -- MgO substrate -- MgO micro cubes -- annealing -- FCC structure -- epitaxially 001 oriented particles -- beta ordered structure -- alpha ordered structure -- 350 to 400 degC -- PdCu MgO -- MgO -- PdCu sub 3 MgO
© EDP Sciences 1997