The nano-indentation in out-of-plane domains of a {001} oriented BaTiO3 single

crystal was performed with a conical indenter of 0.9µm tip radius. The first pop-in occurred at 5mN load. The surface deformation was studied with atomic force microscopy and piezo-response force microscopy. In addition to dislocation structures inside the remanent indentation, a rosette arm pattern was observed. The four identified screw arms were due to created a-domains as well as to at the free surface emerging dislocations of the {110}<11¯0> glide system. For parts of the screw arms, a detailed analysis of the domain and dislocation structure was presented.

Rosette Screw Arms Created by AC-Domain Structures and Dislocations in Barium Titanate during Nanoindentation. G.A.Schneider, T.Scholz, F.J.Espinoza-Beltrán: Applied Physics Letters, 2008, 92[2], 022906