Parts | Days | Selection | Search | Updates | Downloads | Help
KFM: Fachverband Kristalline Festkörper und deren Mikrostruktur
KFM 9: KFM Poster Session
KFM 9.28: Poster
Monday, March 18, 2024, 18:00–20:00, Poster E
Exploring the bonding in quasicrystals — •Felix Meessen1, Jan Köttgen1, Michael Feuerbacher3, Christian Stenz1, Thomas Schmidt1, Jonathan Frank1, Yuan Yu1, and Wuttig Matthias1,2,4 — 11. Institute of Physics (IA), RWTH Aachen University, 52074 Aachen, Germany — 2JARA Institute "Energy-efficient information technology (PGI-10)", RWTH Aachen University, Germany — 3Ernst Ruska-Centrum für Mikroskopie und Spektroskopie mit Elektronen (ER-C), Forschungszentrum Jülich GMBH, 52428 Jülich, Germany — 4JARA-FIT, RWTH Aachen University, Germany
Quasicrystals are a fascinating class of materials. The characteristics and properties are neither typical for covalent compounds nor metals. Instead, the electrons in these solids are in the critical state between delocalization as in metals and localization as in covalent solid. Hence, we have employed Atom Probe Tomography (APT) to investigate the bonding characteristics of quasicrystals, specifically AlPdMn, ZnMgDy, and an AlPdMn approximant. Our focus has been to establish a correlation between the bond-breaking behavior observed in APT and its effects on electrical conductivity, particularly at the critical juncture of electron localization and delocalization. Additionally, we have explored the impact of these atomic-scale interactions on optical properties using Fourier Transform Infrared Spectroscopy (FTIR). The central theme of our study is to understand how these phenomena relate to metavalent bonding. Our findings provide significant insights into the electrical, optical and bonding behavior of these complex materials, offering a deeper understanding of their unique properties.
Keywords: Quasicrystals; Metal Insulator Transition; Bonding; Atomprobe Tomography; Bond Breaking