Characteristics of Samaria-Doped Ceria Prepared by Pechini Method
A. Arabacı and Ö. Serin
Istanbul University, Faculty of Engineering, Department of Metallurgical Engineering, Avcilar 34320, Istanbul, Turkey
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CeO2 ceramics doped with 20 mol.% samarium (SDC-20) were prepared through the Pechini process. The samples were calcined at 400, 700 and 1000°C. The sintering behavior of the calcined SDC-20 powders was also investigated at 1400°C for 6 h. Microstructural and physical properties of SDC-20 samples were characterized with X-ray diffraction, scanning electron microscopy, thermogravimetry and impedance analysis methods. The results of the thermogravimetry/differential thermal analysis and X-ray diffraction indicated that a single-phase fluorite structure formed at a relatively low calcination temperature of 400°C. It is understood from the measured ionic conductivity values that the pellet formed from the SDC-20 samples calcined at 1000°C had lower resistance of grain-boundary than those of the pellets formed from the SDC-20 samples calcined at 400 and 700°C. The maximum ionic conductivity was measured as 1.95× 10-2 S cm-1 at 800°C for the sintered SDC-20 pellet obtained from SDC-20 powders calcined at 1000°C.

DOI: 10.12693/APhysPolA.128.B-118
PACS numbers: