title: On the microstructure of nanoporous gold: an X-ray diffraction study.
abstract: The evolution of the grain structure, internal strain, and the lattice misorientations of nanoporous gold during dealloying of bulk (3D) Ag-Au alloy samples was studied by various in situ and ex situ X-ray diffraction techniques including powder and Laue diffraction. The experiments reveal that the dealloying process preserves the original crystallographic structure but leads to a small spread in orientations within individual grains. Initially, most grains develop in-plane tensile stresses, which are partly released during further dealloying. Simultaneously, the feature size of the developing nanoporous structure increases with increasing dealloying time. Finally, microdiffraction experiments on dealloyed micron-sized nanoporous pillars reveal significant surface damage introduced by focused ion beam milling.
authors.affiliation: Paul Scherrer Institut, CH-5232 Villigen, Switzerland.
authors.forename: Steven
authors.initials: S
authors.lastname: Van Petegem
authors.forename: Stefan
authors.initials: S
authors.lastname: Brandstetter
authors.forename: Andrea M
authors.initials: AM
authors.lastname: Hodge
authors.forename: Bassem S
authors.initials: BS
authors.lastname: El-Dasher
authors.forename: Jurgen
authors.initials: J
authors.lastname: Biener
authors.forename: Bernd
authors.initials: B
authors.lastname: Schmitt
authors.forename: Camelia
authors.initials: C
authors.lastname: Borca
authors.forename: Helena
authors.initials: H
authors.lastname: Van Swygenhoven