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000905435 037__ $$aFZJ-2022-00676
000905435 1001_ $$0P:(DE-Juel1)176716$$aWuttig, Matthias$$b0$$eCorresponding author$$ufzj
000905435 1112_ $$aEPCOS 2021$$cOxford$$d2021-09-13 - 2021-09-15$$wUK
000905435 245__ $$aMetavalent Bonding in Phase Change Materials:Provocation or Promise?
000905435 260__ $$c2021
000905435 3367_ $$033$$2EndNote$$aConference Paper
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000905435 3367_ $$2ORCID$$aLECTURE_SPEECH
000905435 3367_ $$0PUB:(DE-HGF)6$$2PUB:(DE-HGF)$$aConference Presentation$$bconf$$mconf$$s1642493230_18034$$xOther
000905435 520__ $$aScientists and practitioners have long dreamt of designing materials with novel properties. Yet, a hundred years after quantum mechanics lay the foundations for a systematic description of the properties of solids, it is still not possible to predict the best material in applications such as photovoltaics, superconductivity or thermoelectric energy conversion. This is a sign of the complexity of the problem, which is often exacerbated by the need to optimize conflicting material properties. Hence, one can ponder if design routes for materials can be devised.  In recent years, the focus of our work has been on designing advanced functional materials with attractive opto-electronic properties, including phase change materials, thermoelectrics, photonic switches and materials for photovoltaics. Phase Change Materials have provided a special challenge for materials optimization. They possess a remarkable property portfolio, which includes the ability to rapidly switch between the amorphous and crystalline state. Surprisingly, in PCMs both states differ significantly in their properties [1]. This material combination makes them very attractive for applications in rewriteable optical and electronic data storage, as well as photonic switches [2-4]. In this talk, the unconventional material properties will be attributed to a unique bonding mechanism (metavalent bonding) [5]. Further evidence for this bonding mechanism comes from a quantum-chemical map, which separates the known strong bonding mechanisms of metallic, ionic and covalent bonding [6]. The map reveals that metavalent bonding is a new, fundamental bonding mechanism. This insight is subsequently employed to design phase change [7] as well as thermoelectric materials [8]. Yet, the discoveries presented here also force us to revisit the concept of chemical bonds and bring back a history of vivid scientific disputes about ‘the nature of the chemical bond’.
000905435 536__ $$0G:(DE-HGF)POF4-5233$$a5233 - Memristive Materials and Devices (POF4-523)$$cPOF4-523$$fPOF IV$$x0
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000905435 9101_ $$0I:(DE-588b)5008462-8$$6P:(DE-Juel1)176716$$aForschungszentrum Jülich$$b0$$kFZJ
000905435 9131_ $$0G:(DE-HGF)POF4-523$$1G:(DE-HGF)POF4-520$$2G:(DE-HGF)POF4-500$$3G:(DE-HGF)POF4$$4G:(DE-HGF)POF$$9G:(DE-HGF)POF4-5233$$aDE-HGF$$bKey Technologies$$lNatural, Artificial and Cognitive Information Processing$$vNeuromorphic Computing and Network Dynamics$$x0
000905435 9141_ $$y2021
000905435 920__ $$lyes
000905435 9201_ $$0I:(DE-Juel1)PGI-10-20170113$$kPGI-10$$lJARA Institut Green IT$$x0
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