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VERSION:2.0
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BEGIN:VEVENT
DTSTAMP:20260418T140318Z
UID:https://www.mpie.de/events/44884/3755656
DTSTART:20260303T133000Z
DTEND:20260303T143000Z
CLASS:PUBLIC
CREATED:20260223T132051Z
DESCRIPTION:Devices from thermoelectric materials can directly convert heat
  flows into electrical energy powering autonomous sensors or providing rel
 iable electrical power supply in remote areas\, as successfully demonstrat
 ed e.g. by the Voyager space probes or the Mars rovers Curiosity and Perse
 verance. On the other hand\, they can also be employed for maintenance-fre
 e\, seamlessly adjustable and scalable thermal management solutions\, e.g.
  for fuel cells or optoelectronic systems. To unlock further applications 
 of thermoelectric materials alternatives to state-of-the-art bismuth tellu
 ride are required. Magnesium-based TE materials like MgAgSb\, Mg3(Sb\,Bi)2
  and Mg2(Si\,Sn) are among the most promising candidates due to excellent 
 performance\, low cost\, and environmental compatibility. However\, functi
 onal stability under application conditions is an indispensable requiremen
 t\, which proves to be a significant challenge for many high- performance 
 materials\, Mg-based ones in particular. For those\, loss of volatile Mg a
 long grain boundaries as well as demixing are the main challenges. Taking 
 Mg2(Si\,Sn) as example\, we’ll discuss how to derive material transforma
 tion mechanisms from readily available experimental data\, compare their e
 ffect on material transport properties and analyze the influence of enviro
 nmental parameters (temperature\, atmosphere) on the material degradation 
 rate. From this understanding strategies against material instability can 
 be derived effectively and evaluated experimentally. Focussing on Mg loss 
 as the most relevant degradation mechanism we’ll discuss the following a
 pproaches: i) controlling the Mg vapor pressure\, ii) fine-tuning the Mg c
 ontent of the material to avoid loosely bound Mg\, iii) coating\, and iv) 
 grain boundary engineering to stop Mg diffusion. Employing these\, materia
 l degradation is reduced by several orders of magnitude\, resulting in hig
 h-performance materials with enhanced stability.\nSpeaker: Prof. Johannes 
 de Boor 
LAST-MODIFIED:20260223T132432Z
LOCATION:Max Planck Institute for Sustainable Materials\, Room: Large Confe
 rence Room No. 203
ORGANIZER;CN=on invitation of Eleonora Isotta and Prof. Christina Scheu:mai
 lto:
SUMMARY:Problem found\; problem mitigated: overcoming chemical instability 
 in Mg-based thermoelectric materials
URL;VALUE=URI:https://www.mpie.de/events/44884/3755656
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