Synthesis and ionic conductivity of mechanically synthesized yttrium-doped ceria solid solutions

• Main Authors: Ong, Poh Shing, Tan, Yen Ping, Yap, Taufiq Yun Hin, Zainal, Zulkarnain
• Format: Article
• Language: English
• Published: Asian Network for Scientific Information 2011
• Online Access: http://psasir.upm.edu.my/id/eprint/25178/1/Synthesis%20and%20ionic%20conductivity%20of%20mechanically%20synthesized%20yttrium-doped%20ceria%20solid%20solutions.pdf; http://psasir.upm.edu.my/id/eprint/25178/; http://www.scialert.net/abstract/?doi=jas.2011.1285.1290

Doped ceria is considered the most promising high-conducting electrolyte, alternative to the commercially used yttria-stabilized zirconia. The ceria fluorite structure is very tolerant to dissolution of lower valent metal ions. The present employed mechanical method, introduces comparison of mechanical-synthesized yttrium-doped ceria system, denoted as Ce1-xYxO2-δ (0.05≤x≤0.4), which were successfully synthesized by both conventional solid-state and mechanochemical methods. In mechanochemical reaction, fine-grained powders with uniform grain size distribution were obtained. X-ray diffraction analysis showed all solid solutions were single phase with cubic fluorite structure. The electrical conductivity of sintered samples of calcium doped ceria compounds were investigated in air as a function of temperature using AC impedance spectroscopy. Impedance data showed that yttrium-doped ceria electrolyte is a good ionic conductor with conductivity as high as 10-3 ohm cm-1. Further characterization using Differential Thermal Analysis (DTA), Thermo Gravimetric Analysis (TGA) and Scanning Electron Microscopy (SEM) were carried out.