| About this Abstract |
| Meeting |
2020 TMS Annual Meeting & Exhibition
|
| Symposium
|
Atom Probe Tomography for Advanced Characterization of Metals, Minerals and Materials III
|
| Presentation Title |
Compositional Dependencies of Ni- and Fe-oxides to Experimental Parameters in Atom Probe Tomography |
| Author(s) |
Daniel K. Schreiber, Ann Chiaramonti, Karen Kruska |
| On-Site Speaker (Planned) |
Daniel K. Schreiber |
| Abstract Scope |
High-temperature oxidation of metals leads to a complex, 3D menagerie of nanoscopic oxides that can be analyzed successfully and uniquely by atom probe tomography (APT). The identities of these oxide phases can, in principle, be determined by their local composition (i.e. the concentration of oxygen and the ratios of specific cations). Phase identification is critical to revealing the dynamic oxidation processes, but the presence of unexpected and non-stoichiometric phases impedes facile analyses. Furthermore, APT analyses are prone to erroneous O quantification which is not fully understood. In this work, we present systematic analyses of bulk Ni and Fe oxides (NiO, FeO, Fe2O3, Fe3O4 and NiFe2O4) to gain a better understanding of the consistency and error associated with the compositional measurements. New insights into the field evaporation behavior of these metal oxides will also be discussed to suggest general operational parameters and limitations of APT oxide characterization. |
| Proceedings Inclusion? |
Planned: Supplemental Proceedings volume |