Microstructure and mechanical properties of Sm{sub 1-x}Sr{sub x}Co{sub 0.2}Fe{sub 0.8}O{sub 3}
- Materials Sciences Department, Pacific Northwest National Laboratory, Richland, Washington 99352 (United States)
The room temperature mechanical properties of a mixed conducting perovskite Sm{sub 1-x}Sr{sub x}Co{sub 0.2}Fe{sub 0.8}O{sub 3} (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 {approx}70 to {approx}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 {approx}1.1 to {approx}0.7 MPa m1/2. In addition, fractography was used to characterize the fracture behavior in these materials. (c) 2000 Materials Research Society.
- OSTI ID:
- 20217448
- Journal Information:
- Journal of Materials Research, Journal Name: Journal of Materials Research Journal Issue: 7 Vol. 15; ISSN JMREEE; ISSN 0884-2914
- Country of Publication:
- United States
- Language:
- English
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