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

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+ sp...

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Bibliographic Details
Published in:Applied physics letters 2009-08, Vol.95 (5)
Main Authors: Huang, B. X., Malzbender, J., Steinbrech, R. W., Grychtol, P., Schneider, C. M., Singheiser, L.
Format: Article
Language:English
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Summary: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.
ISSN:0003-6951
1077-3118
DOI:10.1063/1.3193657