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Microstructure and Mechanical Properties of Sm1-xSrxCo0.2Fe0.8O3

Published online by Cambridge University Press:  31 January 2011

Y-S. Chou ,
J. W. Stevenson ,
T. R. Armstrong ,
J. S. Hardy ,
K. Hasinska  and
L. R. Pederson
Y-S. Chou
Affiliation:
Materials Sciences Department, Pacific Northwest National Laboratory, Richland, Washington 99352
J. W. Stevenson
Affiliation:
Materials Sciences Department, Pacific Northwest National Laboratory, Richland, Washington 99352
T. R. Armstrong
Affiliation:
Materials Sciences Department, Pacific Northwest National Laboratory, Richland, Washington 99352
J. S. Hardy
Affiliation:
Materials Sciences Department, Pacific Northwest National Laboratory, Richland, Washington 99352
K. Hasinska
Affiliation:
Materials Sciences Department, Pacific Northwest National Laboratory, Richland, Washington 99352
L. R. Pederson
Affiliation:
Materials Sciences Department, Pacific Northwest National Laboratory, Richland, Washington 99352
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Abstract

The room temperature mechanical properties of a mixed conducting perovskite Sm1?xSrxCo0.2Fe0.8O3 (x = 0.2 to 0.8) were examined. Density, crystal phase, and microstructure were characterized. It was found that the grain size increased abruptly with increasing Sr content. Mechanical properties of elastic modulus, microhardness, indentation fracture toughness, and biaxial flexure strength were measured. Young's modulus of 180–193 GPa and shear modulus of 70–75 GPa were determined. The biaxial flexure strength was found to decrease with increasing Sr content from ∼70 to ∼20 MPa. The drop in strength was due to the occurrence of extensive cracking. Indentation toughness showed a similar trend to the strength in that it decreased with increasing Sr content from ∼1.1 to ∼0.7 MPa m1/2. In addition, fractography was used to characterize the fracture behavior in these materials.

Type
Articles
Information
Journal of Materials Research , Volume 15 , Issue 7 , July 2000 , pp. 1505 - 1513
Copyright
Copyright © Materials Research Society 2000

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