Christian Kübel

Precise Nanoscale Mapping of Electric Fields Across Random Grain Boundaries in Polycrystalline Oxides Using Precession‐Assisted 4D‐STEM

ABSTRACT Space charge layers (SCLs) at grain boundaries play a crucial role in modulating electric fields and thereby influence functional properties of materials. However, experimental analysis of these localized electric fields and the corresponding charge distribution remains...

Overcoming Imaging Limitations: 4D‐STEM Pair Distribution Function for Resolving Structure of Supported Pt$_{55}$ and Pt$_{200}$ Clusters

Metallic clusters in the 2–200 atom range exhibit exceptional functional properties arising from their large fraction of under-coordinated surface sites and quantum size effects. However, structural characterization of these clusters is challenging due to the absence of well-defi...