Regensburg 2019 – scientific programme

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DS: Fachverband Dünne Schichten

DS 7: Optical Analysis of Thin Films II (Reflection, Ellipsometry, Raman, IR-DUV Spectroscopy, ...

DS 7.3: Talk

Monday, April 1, 2019, 15:30–15:45, H32

The influence of deposition conditions on the continuous broad sub-bandgap-absorption of the High Entropy Oxide: MgCoNiCuZn-O — •Lars Wenning and Emeline Michel — I. Institute of Physics (IA), RWTH Aachen University, Germany

Introducing entropy as a competing factor to synthesize and engineer new materials has been shown to be a promising way to discover new materials like high entropy alloys, which exhibit astonishing mechanical properties, e.g. combining high fracture toughness and high yield strength. Advancing the idea of entropy stabilized alloys to High Entropy Oxides is expected to lead to novel materials for industrial applications and scientific research. Some high entropy oxides have already shown astounding properties like colossal dielectric constant or room temperature superionic conductivity. This work investigates the extraordinary optical behavior of MgCoNiCuZn-oxide thin films and the influence of processing conditions during the reactive sputter deposition. To this end the films are characterized employing a variety of techniques including X-ray diffraction as well as optical characterization using ellipsometric spectroscopy and FT-IR spectroscopy.