Grain boundary Fe-doping effects in LSGM

摘要：

The electrical properties of La0.95Sr0.05Ga0.90Mg0.10O3-δ (LSGM) were modified by selective doping of the grain boundaries, using LaFeO3 screen-printed layers and annealing at high temperature to promote Fe diffusion into LSGM. Scanning electron microscopy (SEM) and energy-dispersive spectroscopy (EDS) analyses showed that iron was mainly located along the grain boundaries with the bulk grain composition almost unchanged. Impedance spectra showed a significant increase in the total conductivity for the Fe-doped samples, the effect being greater for the grain boundary contribution. The formation of a parallel pathway for electronic conduction along the grain boundaries explains these effects. Ageing of these samples at high temperature, after removal of the Fe source, showed a steady shift to the original LSGM behaviour, due to dilution of Fe throughout the samples.

关键词： Lanthanum gallate Grain boundary Mized conductor Impedance spectroscopy

作者: E.Gomes F.M.Figueiredo F.M.B.Marqus

作者单位: Ceramic Eng.Dept./CICECO, University of Aveiro, P3810-193 Aveiro, Portugal ESTG, Institute Politecni Ceramic Eng.Dept./CICECO, University of Aveiro, P3810-193 Aveiro, Portugal Sci.and Tech.Dep./CICECO, Ceramic Eng.Dept./CICECO, University of Aveiro, P3810-193 Aveiro, Portugal

会议类型: 国际会议

会议名称: The 16th International Conference on Solid State Ionics(第十六届国际固态离子学会议)

会议地点: 上海

会议语种:英文

页码: 900-903

在线出版日期: 2007-07-01（万方平台首次上网日期，不代表论文的发表时间）