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Lecture

WEB In-situ flash sintering studies of Gadolinium-doped Ceria: onset of flash and densification behavior

Thursday (24.09.2020)
15:40 - 15:55 P: Processing and Synthesis 1
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Flash Sintering (FS) is a process whereby sintering can be achieved in mere seconds at unusually low temperatures by the application of modest electrical fields. A broad class of ceramics, including ionic conductors, electronic conductors, insulators and semiconductors show this phenomenon. However, the underlying mechanism of flash sintering remains unclear. In-situ flash experiments are necessary to understand the highly nonlinear behaviors during the flash state. Two different in-situ analysis were carried out on 10 mol% gadolinium-doped ceria (GDC10), which is predominantly an ionic conductor in air. Electrochemical reduction and associated n-type electronic conductivity in GDC10 during the flash sintering under DC is shown to contribute to the onset of flash. Additionally, in-situ flash sintering experiments were performed at the synchrotron (Brookhaven National Laboratory) to understand the temperature and domain size evolution. Inhomogeneous peak broadening and peak splitting at the positive electrodes is found during the flash, indicating a nonuniform lattice distortion due to the crystallographic defects generation.

Speaker:
Dr.-Ing. Tarini Prasad Mishra
Forschungszentrum Jülich GmbH