TY  - JOUR
AU  - Jones, Robert O.
AU  - Elliott, Stephen R.
AU  - Dronskowski, Richard
TI  - The Myth of “Metavalency” in Phase‐Change Materials
JO  - Advanced materials
VL  - 35
IS  - 30
SN  - 0935-9648
CY  - Weinheim
PB  - Wiley-VCH
M1  - FZJ-2023-02346
SP  - 2300836
PY  - 2023
AB  - 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.
LB  - PUB:(DE-HGF)16
C6  - 37162226
UR  - <Go to ISI:>//WOS:000984957200001
DO  - DOI:10.1002/adma.202300836
UR  - https://juser.fz-juelich.de/record/1008446
ER  -