Anomalies in the thermomechanical behavior of Ba0.5Sr0.5Co0.8Fe0.2O3-δ ceramic oxygen conductive membranes at intermediate temperatures

Huang, B. X.; Malzbender, J.; Steinbrech, R. W.; Grychtol, P.; Schneider, C. M.; Singheiser, L.
August 2009
Applied Physics Letters;8/3/2009, Vol. 95 Issue 5, p051901
Academic Journal
The thermomechanical properties of Ba0.5Sr0.5Co0.8Fe0.2O3-δ (BSCF) were measured using ring-on-ring tests and depth-sensitive microindentation. The cubic BSCF material exhibits an anomaly in mechanical properties between 200 and 400 °C. The observed anomaly is attributed to the transition of Co3+ spin states which is experimentally confirmed by susceptibility measurements. Furthermore, slip lines were observed around the impression when indentation tests were carried out above 260 °C.


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