% IMPORTANT: The following is UTF-8 encoded.  This means that in the presence
% of non-ASCII characters, it will not work with BibTeX 0.99 or older.
% Instead, you should use an up-to-date BibTeX implementation like “bibtex8” or
% “biber”.

@INPROCEEDINGS{Wuttig:905426,
      author       = {Wuttig, Matthias},
      title        = {{M}etavalent {B}onding in {S}olids: {P}rovocation or
                      {P}romise?},
      reportid     = {FZJ-2022-00667},
      year         = {2021},
      abstract     = {Scientists and practitioners have long dreamt of designing
                      materials with novel properties. Yet, a hundred years after
                      quantum mechanics lay the foundations for a systematic
                      description of the properties of solids, it is still not
                      possible to predict the best material in applications such
                      as photovoltaics, superconductivity or thermoelectric energy
                      conversion. This is a sign of the complexity of the problem,
                      which is often exacerbated by the need to optimize
                      conflicting material properties. Hence, one can ponder if
                      design routes for materials can be devised. In recent years,
                      the focus of our work has been on designing advanced
                      functional materials with attractive opto-electronic
                      properties, including phase change materials,
                      thermoelectrics, photonic switches and materials for
                      photovoltaics. These materials are typically discussed as
                      unconventional semiconductors, often but not always, with
                      appreciable charge transfer. Phase Change Materials have
                      provided a special challenge for materials optimization.
                      They possess a remarkable property portfolio, which includes
                      the ability to rapidly switch between the amorphous and
                      crystalline state. Surprisingly, in PCMs both states differ
                      significantly in their properties. This material combination
                      makes them very attractive for applications in rewriteable
                      optical and electronic data storage, as well as photonic
                      switches. In this talk, the unconventional material
                      properties will be attributed to a unique bonding mechanism
                      (metavalent bonding). Further evidence for this bonding
                      mechanism comes from a quantum-chemical map, which separates
                      the known strong bonding mechanisms of metallic, ionic and
                      covalent bonding. The map reveals that metavalent bonding is
                      a new, fundamental bonding mechanism, which differs
                      substantially from metallic, covalent and ionic bonding.
                      This insight is subsequently employed to design phase change
                      as well as thermoelectric materials. Yet, the discoveries
                      presented here also force us to revisit the concept of
                      chemical bonds and bring back a history of vivid scientific
                      disputes about ‘the nature of the chemical bond’.},
      month         = {Apr},
      date          = {2021-04-17},
      organization  = {2021 Virtual MRS Spring Meeting,
                       Seattle (USA), 17 Apr 2021 - 23 Apr
                       2021},
      subtyp        = {Invited},
      cin          = {PGI-10},
      cid          = {I:(DE-Juel1)PGI-10-20170113},
      pnm          = {5233 - Memristive Materials and Devices (POF4-523)},
      pid          = {G:(DE-HGF)POF4-5233},
      typ          = {PUB:(DE-HGF)6},
      url          = {https://juser.fz-juelich.de/record/905426},
}