Ordering and crystallographic reorientation of PtNi alloy nanoparticles probed by in situ BCDI looking at fundamental and superstructure ref

In this proposal, we intend to address by in situ Bragg coherent diffraction imaging (BCDI) a striking phenomenon that has been recently observed by our collaborators in Technion (group of E. Rabkin, Technion/Israel), which are the ordering and reorientation of disordered PtNi alloy (50:50 composition) nanoparticles after annealing at 550°C. The new EBS beam and BCDI make it possible to probe in situ crystallographic reorientation of single particles (from [111]- to [001]-oriented particles) and ordering through superstructure reflections.