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Abstract:
In Atom Probe Tomography (APT) the process of field evaporation governs the progress of an analysis. The Field Evaporation Field (FEF) is known to exhibit different strengths for different crystallographic directions for pure metals. However this is not considered in currently used APT-models. This presentation will introduce a method to calculate small differences in the FEF for crystallographic directions from experimental APT data of W.
To obtain this information we developed an upgraded version of the AtomVicinity algorithm, which is mostly identical to what is also called “spatial distribution maps”. It allows calculating the average atomic neighborhood of atoms. This can also be utilized to determine site occupation of ternary elements in ordered phases, which will be discussed for the Ti-Al system.
The results were acquired with two different commercial atom probes, the Laser assisted Wide Angle Atom Probe (LA-WATAP) and the Local Electrode Atom Probe (LEAP 4000). Additionally, this approach allows a comparison of the spatial resolution of these two devices.
CV
Education
Diplom Physik (M.S. physics) ,GöttingenUniversity 2006
Dr. rer. nat. (PhD in physics), GöttingenUniversity 2010
Since 05/2010 Postdoctoral Fellow at the King Abdullah University for Science & Technology, Kingdom of Saudi Arabia KSA.
Awards and Recognition
“Best Oral Presentation Award”, International Field Emission Sym. IFES Guilin, PR China 2006.
Dr. Boll was involved in his MS and PhD thesis in a scientific bi-national project between the Universities of Göttingen and Nanjing (Deutsche ForschungGemeinschaftDFG and Chinese Academy of Science) and visited Nanjing University in 2006 and 2008.
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