Publication: Preparation of yttria-stabilized zirconia by the reverse microemulsion method and the effect of sc and ce doping on microstructure and ıonic conductivity for solid oxide fuel cell applications
Program
KU-Authors
KU Authors
Co-Authors
Öksüzömer, Faruk
Vatansever, Sibel
Koç, Serkan Naci
Deligöz, Hüseyin
Gürkaynak, Mehmet A.
Advisor
Publication Date
Language
English
Type
Journal Title
Journal ISSN
Volume Title
Abstract
In this study, 8 mol% yttria-stabilized zirconia (8YSZ), ceria-, and scandia-doped YSZ powders were synthesized by the reverse microemulsion method. The powders were calcined at 1000 degrees C and sintered at 1450 degrees C. The crystalline properties and microstructure of the samples were characterized by X-ray diffraction and SEM methods, respectively. Oxygen ionic conductivities of the samples were measured by electrochemical impedance spectroscopy in the temperature range 250-375 degrees C. Grain interior and grain boundary resistivities were also calculated. Particle sizes of YSZ and Sc-doped YSZ were found to be < 100 nm, while that of Ce-doped YSZ was 120-150 nm. Approximately 1 mu m grains were observed after sintering of YSZ at 1450 degrees C. Particularly, the grain boundary and also the grain interior resistivities decreased with 3% scandia-doped YSZ. It was observed that the total conductivity of 3YSZ was higher than that of 3% ceria-doped YSZ.
Description
Source:
International Journal of Applied Ceramic Technology
Publisher:
Wiley-Blackwell Publishing, Inc
Keywords:
Subject
Materials Science, Ceramics