| About this Abstract |
| Meeting |
MS&T23: Materials Science & Technology
|
| Symposium
|
Manufacturing and Processing of Advanced Ceramic Materials
|
| Presentation Title |
Microstructure and Electrical Conductivity of Sol-gel Synthesized and Spark Plasma Sintered Doped-lanthanum Gallate |
| Author(s) |
Eliana Navarro dos Santos Muccillo, Shirley Reis, Cyrille Gonin, Marcos Berton, Reginaldo Muccillo |
| On-Site Speaker (Planned) |
Eliana Navarro dos Santos Muccillo |
| Abstract Scope |
Perovskite ceramics consisting of lanthanum gallate with partial substitutions for strontium and magnesium are candidates as solid electrolyte for application in solid oxide fuel cells operating at intermediate temperatures (~550 to ~750ºC). The main concern related to the application of this perovskite solid electrolyte is impurity phases, usually detected even in chemically synthesized powders. The La0.9Sr0.1Ga0.8Mg0.2O3-d (LSGM) composition display relatively low contents of impurity phases. In this work, the LSGM composition was synthesized by the sol-gel method and consolidated by spark plasma sintering to optimize the microstructure and electrical properties of this solid electrolyte. Chemically synthesized powders were consolidated in the 1100 to 1250ºC for 5 min. Sintered specimens with relative densities higher than 98% were obtained. Rietveld analysis of X-ray diffraction data revealed no detectable impurity phases. The microstructure evolution exhibited submicron sized grains with mixed fracture mode. High values of the electrical conductivity were obtained for all specimens. |