Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe
KFM: Fachverband Kristalline Festkörper und deren Mikrostruktur
KFM 14: Poster
KFM 14.17: Poster
Mittwoch, 19. März 2025, 17:00–18:30, P1
3D nanoscale chemical analysis of WO3 using Atom Probe Tomography — •Katharina Wolk1, Jack T. Eckstein2, Kasper A. Hunnestad1, Constantinos A. Hatzoglou1, Gustau Catalán3, Ekhard K. H. Salje2, Julia Glaum1, and Dennis Meier1 — 1Department of Materials Science and Engineering, NTNU Norwegian University of Science and Technology, Trondheim, Norway — 2Department of Earth Sciences, University of Cambridge, Cambridge, UK — 3Institut Català de Nanociència i Nanotecnologia, Campus Universitat Autònoma de Barcelona, Bellaterra, Catalonia
The functional properties of oxides are closely linked to their chemical composition. The transition metal oxide WO3 is notable for its structural versatility and unusual physical properties, such as the formation of superconducting ferroelastic domain walls. To understand the relation between local variations in chemical composition and material properties, we apply atom probe tomography (APT). APT offers compositional mapping in 3D with sub-nanometer spatial resolution and chemical sensitivity of 100 ppm. Using scanning electron microscopy, we image the ferroelastic domain structure in WO3 single crystals and extract specimens from different regions of interest with a focused ion beam for the APT analysis. Based on 3D reconstructions, we investigate site-specific variations in chemical composition, exploring the oxidation state and potential formation of oxygen defects. Varying experimental APT parameters, such as laser energy, enables insights into optimizing compositional accuracy.
Keywords: Atom Probe Tomography (APT); Focused Ion Beam (FIB); Scanning Electron Microscopy (SEM); chemical composition; WO3