SKM 2023 – wissenschaftliches Programm

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MM: Fachverband Metall- und Materialphysik

MM 12: Poster I

MM 12.23: Poster

Montag, 27. März 2023, 18:15–20:00, P2/OG1+2

Towards understanding the chemical bonding of unconventional metals — •Christian Stenz, Johannes Holters, and Matthias Wuttig — Institute of Physics IA, RWTH Aachen University, 52074 Aachen, Germany.

Solids can be distinguished based on their properties such as the band gap, effective coordination number, electrical conductivity, Born effective charge and so on. Based on these properties a classification into metallic, covalent, ionic and metavalent bonding seems appropriate. Metavalent bonding is a distinct bonding mechanism characterized by a competition between electron localization and electron delocalization. Chalcogenides like GeTe and Sb₂Te₃ and pnictides like Sb employ this bonding mechanism and can be characterized as ’incipient metals’. This raises the question if there are related metals, which are characterized by the same competition between electron localization and electron delocalization. We thus have been looking for such unconventional metals and focus on compounds of Te with transition metals. The overlap between Te p- and transition metal d- orbitals gives rise to a configuration which resembles the p-p σ-bond in incipient metals. Hence we are looking for related fingerprints such as soft, anharmonic bonds, an unconventional bond rupture and other characteristics which are found for incipient metals.