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Fabrication and properties of high temperature proton conducting perovskites

AuthorsMartínez-Fernández, Julián; López-Robledo, M. J. CSIC ORCID; Ramírez de Arellano López, Antonio; Real Pérez, Concepción; Peña, J. I. CSIC ORCID; Sayir, Ali
Issue Date2006
PublisherElectrochemical Society
CitationECS Transactions 3(1): 459-469 (2006)
AbstractHigh temperature protonic conductors (HTPC) were fabricated by solid-state sintering and by melt processing by laser-heated floating zone method. Several families of compositions were selected: SrCe1-xMxO3- (with M: Zr and Y; x = 0.1, 0.2), BaCe1-xMxO3- (with Yb, Ca and Y; x = 0.05, 0.2), Sr3Ca1.18Nb1.82O9-, SrZr0.8Y0.2O3- and SrTi0.95Sc0.05O3-. Their mechanical properties have been studied by compression test at constant load and constant compression rate.As produced directionally solidified materials presented a unique microstructure consisting of strongly textured cells with an intercellular phase. The cells have a crystalline Pnma structure. The relation between the processing, dopants, microstructure and mechanical properties is discussed. Understanding of plasticity is important to determine the ultimate component performance, and because its direct relationship to processing and transport. The high temperature mechanical properties of melt grown crystals are superior to the mechanical properties of polycrystals.
Description11 pages.-- En: 210th ECS Meeting, Proton Exchange Membrane Fuel Cells 6 Editor(s): T. Fuller, C. Bock, S. Cleghorn, H. Gasteiger, T. Jarvi, M. Mathias, M. Murthy, T. Nguyen, V. Ramani, E. Stuve, T. Zawodzinski.
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