Electrical and mechanical characterization by instrumented indentation technique of La0.85Sr0.15Ga0.8Mg0.2O3− electrolyte for SOFCs

Autor: A. Moure, Joan Josep Roa, Miguel Morales, Jesus Tartaj, Mercè Segarra, José Manuel Pérez-Falcón
Přispěvatelé: Universitat Politècnica de Catalunya. Departament de Ciència dels Materials i Enginyeria Metal·lúrgica
Rok vydání: 2012
Předmět:
Zdroj: UPCommons. Portal del coneixement obert de la UPC
Universitat Politècnica de Catalunya (UPC)
Recercat. Dipósit de la Recerca de Catalunya
instname
ISSN: 0955-2219
DOI: 10.1016/j.jeurceramsoc.2012.07.022
Popis: La 0.85 Sr 0.15 Ga 0.8 Mg 0.2 O 3− δ pellets obtained by the polymeric organic complex solution method, isostatic pressing and sintering at 1350 °C have been electrical and mechanically studied. Electrical measurements evidenced reasonable ionic conductivities (0.01 S cm −1 at 800 °C), which were comparable to those reported for the La 1− x Sr x Ga 1− y Mg y O 3− δ prepared by other synthesis methods. On the other hand, the mechanical properties (elastic modulus, E and hardness, H ) have been determined at micro/nanometric scale using the instrumented indentation technique. While E did not vary significantly with the increasing indentation depth ( h ), H values strongly decreased with the indentation depth up to 500 nm. For h > 500 nm, both mechanical properties remained almost constant, thus obtaining E = 271 ± 6 GPa and H = 13.2 ± 0.4 GPa. Finally, the residual imprints and fracture mechanisms have been observed by atomic force microscopy (AFM).
Databáze: OpenAIRE
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