Microstructure and mechanical properties of Sm1-xSrx Co0.2Fe0.8O3

Y. S. Chou, J. W. Stevenson, T. R. Armstrong, J. S. Hardy, K. Hasinska, L. R. Pederson

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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.

    Original languageEnglish
    Pages (from-to)1505-1513
    Number of pages9
    JournalJournal of Materials Research
    Volume15
    Issue number7
    DOIs
    Publication statusPublished - Jul 2000

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    ASJC Scopus subject areas

    • Materials Science(all)
    • Condensed Matter Physics
    • Mechanics of Materials
    • Mechanical Engineering

    Cite this

    Chou, Y. S., Stevenson, J. W., Armstrong, T. R., Hardy, J. S., Hasinska, K., & Pederson, L. R. (2000). Microstructure and mechanical properties of Sm1-xSrx Co0.2Fe0.8O3. Journal of Materials Research, 15(7), 1505-1513. https://doi.org/10.1557/JMR.2000.0216