Microwave synthesis & sintering of Sm and Ca co-doped ceria ceramics

Abstract

In this work we report on the combined use of microwave (MW) heating sources for the powdersynthesisandthe ceramic sinteringofSmandCaco-doped ceria Ce0.8Sm0.18Ca0.02O1.9 polycrystalline materials for potential application as an electrolyte in intermediatetemperature solid oxide fuel cells (IT-SOFCs). We investigate the crystal structure, ceramic microstructure and the oxygen ion conductivity in detail and compare the latter to conventionally sintered ceramics. MW sintering of ceramic pellets leads to only slightly increased resistivity as compared to conventional sintering, but offers massive energy and time savings for potential industrial production processes. Exceptionally high oxygen ion conductivity without any significant electronic contribution was found in MW synthesized and MW sintered pellets, where the total resistivity, composed of grain boundary and bulk contributions, was found to be in the range of 0.5-1 kohmios at 500 ºC. Sm- and Ca co-doped ceria may be well-suited for electrolyte materials in IT-SOFCs.