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IRAMIS "Saclay Institute of Matter and Radiation" is the 2nd Institute in size of the CEA Matter Sciences Division (DSM). IRAMIS gathers 6 joint Research Units in association with CNRS, Ecole Polytechnique or ENSICAEN.

The research in physics and chemistry carried out at the Institute is in close connection with the societal issues and CEA programs :

Mostly fundamental, the research is open to the creation of economic value and technology transfer. To carry out this research program, the teams of IRAMIS implements leading foreground facilities and scientific equipments, and are also very active around the Great Europeans Instruments.

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Structural stability of anhydrous proton conducting Sr Zr0.9 Er0.1 O3-d perovskite ceramic vs. protonation/deprotonation cycling: Neutron diffraction and Raman studies   

Aneta Slodczyk, Philippe Colomban, Settakorn Upasen, Frédéric Grasset ,Gilles André

Long-term chemical and structural stability of anion conducting ceramic is one of the main criteria for its selection as an electrolytic membrane in energy plant devices. Consequently, medium density SrZr0.9Er0.1O3-d (SZE) anhydrous proton conducting ceramic – a potential electrolyte of SOFC/PCFC was analysed by neutron diffraction between room temperature and 900 °C. After the first heating/cooling cycle, the ceramic pieces were exposed to water vapour pressure in an autoclave (500 °C, 40 bar, 7 days) in order to incorporate protonic species; the protonated compound was then again analysed by neutron diffraction. This procedure was repeated two times. At each step, the sample was also controlled by TGA and Raman spectroscopy. These studies allow the first comprehensive comparison of structural and chemical stability during the protonation/deprotonation cycling. The results reveal good structural stability, although an irreversible small contraction of the unit-cell volume and local structure modifications near Zr/ErO5[] octahedra are detected after the first protonation. After the second protonation easy ceramic crumbling under a stress is observed because of the presence of secondary phases (SrCO3, Sr(OH)2) well detected by Raman scattering and TGA. The role of crystallographic purity, substituting element and residual porosity in the proton conducting perovskite electrolyte stability is discussed.

A. Menelle, 2015-08-21


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