Effect of Chemical Composition on the Nanoscale Ordering Transformations of Physical Mixtures of Pd and Cu Nanoparticles
(a) Color map of the XRD intensity evolution for the PdCu 3 : 1 nanoparticle mixture on the SiO2/Si substrate isothermally annealed at 450°C in a forming gas atmosphere showing the formation of the ordered B2 phase and another alloyed phase (see also ). The heating process started at time 60 sec. (b) Color map of the XRD intensity evolution of the PdCu nanoparticle mixture on the SiO2/Si ramp annealed from 450°C to 750°C in a forming gas atmosphere showing the incomplete transformation of the B2 phase into the disordered fcc alloy phase. (c) -2 XRD scans after annealing at 450°C and 750°C. (d) Time evolution of the calculated XRD integrated intensities corresponding to the various peaks shown in (b) during ramp annealing from 450° to 750°C.