Study on rare earth electrolyte of SDC-LSGM

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• 作者：Dan XU ; Xiaomei LIU ; Chengjun ZHU ; Dejun WANG ; Duanting YAN ; Deyong WANG ; Wenhui SU
• 关键词：composite electrolyte ; SDC ; electronic conductivity ; ionic transport number ; rare earths
• 刊名：Journal of Rare Earths
• 出版年：2008
• 出版时间：April 2008
• 年：2008
• 卷：26
• 期：2
• 页码：241-244
• 全文大小：291 K

文摘

Ce_0.85Sm_0.15O_1.925 (SDC) and La_0.9Sr_0.1Ga_0.8Mg_0.2O_2.85 (LSGM) were synthesized using Glycine-Nitrate Process (GNP), and the composite electrolytes were prepared by mixing SDC and LSGM. An X-ray diffraction pattern indicated that the mixture of SDC and LSGM consisted of their original phases after heating at 1450 ^oC for 10 h. The electronic conductivity of SDC-LSGM composite electrolytes were measured by direct current polarization method using Hebb-Wagner ion blocking cell at 700–800 ^oC in the oxygen partial pressure range of 10⁻⁶–10⁻²⁰ MPa and compared with the results of SDC. Typical polarization curves, which were theoretically predicted, were observed on all the samples. The slopes of lg σ _e–lgPo₂ plot for all the composite electrolytes agreed with the theoretically predicted value of −1/4 at some intermediate oxygen partial pressures and -1/6 at low oxygen partial pressure. The electronic conductivity of SDC-LSGM composite electrolytes decreased with the increase in LSGM content, whereas the ionic transport number t_i of all the samples increased with the increase in LSGM content.