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PGI Kolloquium:


Prof. Dr. William Chueh,
Stanford University, USA

PGI Lecture Hall, Building 04.8, 2nd Floor, Room 365

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02.12.2016 11:00 Uhr

Defect Chemistry of Oxides at the Mesoscale


ChuehCopyright: Prof. Dr. Chueh

Ion-insertion and redistribution processes in solids, such as that involving lithium and oxygen ions, underpin energy and information transformation devices such as batteries, fuel cells, and resistive switching memories.

The relevant length scales span point defects/molecules (atomic scale), extended defects such as dislocations, interfaces, particles, and ensembles of particles (mesoscale and macroscale). Hetereogenities in ion concentration develop at the meso- and macro-scale as a result of chemo-mechanical coupling, phase transition, and variation in interfacial/surface kinetics. Such heterogeneities are directly connected to device functionality, performance and reliability, both positively and negatively.

My group have been investigating several prototypical mixed ionic and electronic conductors such as LixFePO4 and CeO2-x using in-situ electron X-ray spectro-microscopy. In this talk, I will discuss our recent progress in understanding and controlling defect formation and transport spanning atomic, meso and macro-scales.


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Stephan Menzel
Telefon: +49 2461 61-6074
E-Mail: st.menzel@fz-juelich.de

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