Journal Article

FZJ-2023-02346

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png The Myth of “Metavalency” in Phase‐Change Materials

Jones, R. O. (Corresponding author)FZJ* ; Elliott, S. R. ; Dronskowski, R.

2023
Wiley-VCH Weinheim

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Please use a persistent id in citations: doi:10.1002/adma.202300836  doi:10.34734/FZJ-2023-02346

Abstract: Phase-change memory materials (PCMs) have unusual properties and important applications, and recent efforts to find improved materials have focused on their bonding mechanisms. “Metavalent bonding” or “metavalency,” intermediate between “metallic” and “covalent” bonding and comprising single-electron bonds, has been proposed as a fundamentally new mechanism that is relevant both here and for halide perovskite materials. However, it is shown that PCMs, which violate the octet rule, have two types of covalent bond: two-center, two-electron (2c-2e) bonds, and electron-rich, multicenter bonds (3c-4e bonds, hyperbonds) involving lone-pair electrons. The latter have bond orders less than one and are examples of the century-old concept of “partial” bonds.

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Contributing Institute(s):

1. Quanten-Theorie der Materialien (PGI-1)
2. Quanten-Theorie der Materialien (IAS-1)

Research Program(s):

1. 5211 - Topological Matter (POF4-521) (POF4-521)

Appears in the scientific report 2023

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Database coverage:
; ; ; Clarivate Analytics Master Journal List ; Current Contents - Engineering, Computing and Technology ; Current Contents - Physical, Chemical and Earth Sciences ; DEAL Wiley ; Essential Science Indicators ; IF >= 25 ; JCR ; Nationallizenz ; SCOPUS ; Science Citation Index Expanded ; Web of Science Core Collection

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