The enhanced electronic transference number at the grain boundaries in Sr-doped LaGaO3
The partial electron-hole conductivity of the bulk and the grain boundary of 1 mol% Sr-doped LaGaO3 has been measured separately using a dc-polarization method employing an oxygen ion-blocking cell. The electronic transference number for the electron-hole at the grain boundary was found to be greater than that in the bulk. This is because the oxygen vacancy depletes more severely in the grain boundary area than the electron-hole does to form the space charge zone, due to its higher effective charge compared to that of the electron-hole. Such a local variation in the electronic transfer number thus confirms that the conduction across the grain boundary in 1 mol% Sr-doped LaGaO3 is controlled by the space charge. These results are consistent with those previously reported based on the ac impedance studies.
Solid electrolyte Grain boundary conduction Space charge Electron-hole transfer number Dc-polarization cell
Hee Jung Park Sangtae Kim
Department of Chemical Engineering and Materials Science, University of California Davis, CA 95616, USA
国际会议
The 16th International Conference on Solid State Ionics(第十六届国际固态离子学会议)
上海
英文
1329-1332
2007-07-01（万方平台首次上网日期，不代表论文的发表时间）