Highlights

Recent group news and highlights - Team "Oxydes et Électro-Céramiques Architecturées pour l’Énergie et l’Électronique"

“Cool-SPS” :

 

Figure  : Sintering methods evolution : towards more sustainable processes

The use of materials, in the fields of electronics, calysis, health (…) requires a control over their shaping (dense or porous materials, coarse or fine-grained materials…). Generally, this objective is reached through the elaboration of ceramiques, built of multiple grains “welded” with each other, during a high temperature sintering (T>1000°C). Spark Plasma Sintering (SPS) is an advanced densification method that can be efficient at low temperature, as demonstrated at the ICMCB by the acquisition of a proof of concept concerning fragile materials for electronic applications. This breakthrough opens the way for the development of new classes of materials, more sustainable and with a better potential for retreatment and recycling.

  • Hérisson de Beauvoir T., Sangregorio A., Cornu I., Elissalde C., Josse M. Cool-SPS: an opportunity for low temperature sintering of thermodynamically fragile materials. Journal of Materials Chemistry C: Materials for Optical and Electronic Devices 2018, vol. 6, n° 9, p. 2229-2233. DOI : 10.1039/C7TC05640K

contact : michael.josse@icmcb.cnrs.fr

 

“molecular ceramics” :

Figure  : SEM picture of a copper acetate diamine molecular ceramic (inset : crystal structure of this materials showing the three-dimensional organization of neutral complexes Cu(CH3COO)2 · 2(NH3))

In the framework of an exploratory research dedicated to new ferroic materials, copper acetate diamine has been obtained as a dense ceramic by Cool-SPS. This material is built on a three-dimensional arrangement of neutral complexes with formulation Cu(CH3COO)2  · 2(NH3). The crystal structure being stabilized by hydrogen bonds, it belongs to the class of  molecular materials and, as a consequence, its ceramics is the first molecular ceramic ever obtained. This constitutes a major breakthrough in the field of molecular materials, as the availability of molecular ceramics will enable new characterisation methods and will ease the integration and use in functional components and devices.

  • Hérisson de Beauvoir, V. Villemot, M. Josse. “Cool-SPS an opportunity for the development of molecular ceramicssoumis à Solid State Sciences

contact : michael.josse@icmcb.cnrs.fr

 

“SOFCs” :

Assembly for the isotopic exchange of oxygen under pressure

As part of a project in collaboration with the CEA funded by GDR HysPac, the ICMCB has developed equipment for isotopic oxygen exchange under pressures up to 30 bar. This completely original assembly makes it possible to determine the ionic conductivity of ceramics conductive by O2– ions under real operating conditions of a High Temperature steam electrolyser. Measurements on conventional SOFC cell materials can also be performed. The oxygen diffusion profiles are recorded by ToF-SIMS in collaboration with PLACAMAT. It is noted that the use of other isotopic markers (N2 for example) is possible.

contact : jean-marc.bassat@icmcb.cnrs.fr