Journal Article

FZJ-2019-06546

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Unique Bond Breaking in Crystalline Phase Change Materials and the Quest for Metavalent Bonding

Zhu, M. ; Cojocaru-Mirédin, O. ; Mio, A. M. ; Keutgen, J. ; Küpers, M. ; Yu, Y. ; Cho, J.-Y. ; Dronskowski, R. ; Wuttig, M. (Corresponding author)FZJ*

2018
Wiley-VCH Weinheim

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Please use a persistent id in citations: http://hdl.handle.net/2128/23678  doi:10.1002/adma.201706735

Abstract: Laser‐assisted field evaporation is studied in a large number of compounds, including amorphous and crystalline phase change materials employing atom probe tomography. This study reveals significant differences in field evaporation between amorphous and crystalline phase change materials. High probabilities for multiple events with more than a single ion detected per laser pulse are only found for crystalline phase change materials. The specifics of this unusual field evaporation are unlike any other mechanism shown previously to lead to high probabilities of multiple events. On the contrary, amorphous phase change materials as well as other covalently bonded compounds and metals possess much lower probabilities for multiple events. Hence, laser‐assisted field evaporation in amorphous and crystalline phase change materials reveals striking differences in bond rupture. This is indicative for pronounced differences in bonding. These findings imply that the bonding mechanism in crystalline phase change materials differs substantially from conventional bonding mechanisms such as metallic, ionic, and covalent bonding. Instead, the data reported here confirm a recently developed conjecture, namely that metavalent bonding is a novel bonding mechanism besides those mentioned previously.

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Contributing Institute(s):

1. JARA Institut Green IT (PGI-10)

Research Program(s):

1. 521 - Controlling Electron Charge-Based Phenomena (POF3-521) (POF3-521)

Appears in the scientific report 2019

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Database coverage:
; ; ; Clarivate Analytics Master Journal List ; Current Contents - Engineering, Computing and Technology ; Current Contents - Physical, Chemical and Earth Sciences ; IF >= 20 ; JCR ; NCBI Molecular Biology Database ; Nationallizenz ; SCOPUS ; Science Citation Index ; Science Citation Index Expanded ; Web of Science Core Collection

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