Mechanical properties of La1-xSrxCo0.2Fe0.8O3 mixed-conducting perovskites made by the combustion synthesis technique

Yeong Shyung Chou, Jeffrey W. Stevenson, Timothy R. Armstrong, Larry R. Pederson

Research output: Contribution to journalArticle

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Abstract

This paper examined the room-temperature mechanical properties of a mixed-conducting perovskite La1-xSrxCo0.2Fe0.8O3 (x = 0.2-0.8). Powders were made by the combustion synthesis technique and sintered at 1250 °C in air. Sintered density, crystal phase, and grain size were characterized. Young's and shear moduli, microhardness, indentation fracture toughness, and biaxial flexure strength were determined. The Young's and shear moduli slightly increased with increasing strontium content. Young's modulus of 151-188 GPa and shear modulus of 57-75 GPa were measured. Biaxial flexure strength of approximately 160 MPa was measured for lower strontium content batches. Strength greatly decreased to approximately 40 MPa at higher strontium concentrations (x = 0.6-0.8) because of the formation of extensive cracking. Indentation toughness showed a higher value (approximately 1.5 MPa·m1/2) for low strontium (x = 0.2) content and a lower value (approximately 1.1 MPa·m1/2) for the other batches (x = 0.4-0.8). Materials with fine and coarse grain size were also tested at various indent loads and showed no dependence of toughness on crack size. In addition, fractography was used to characterize the critical flaw and fracture mode.

Original languageEnglish
Pages (from-to)1457-1464
Number of pages8
JournalJournal of the American Ceramic Society
Volume83
Issue number6
Publication statusPublished - 2000
Externally publishedYes

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Combustion synthesis
strontium
mechanical property
Young modulus
shear modulus
Strontium
combustion
Elastic moduli
Mechanical properties
indentation
flexure
grain size
Indentation
Toughness
fracture toughness
perovskite
Fractography
crack
crystal
Powders

ASJC Scopus subject areas

  • Ceramics and Composites

Cite this

Mechanical properties of La1-xSrxCo0.2Fe0.8O3 mixed-conducting perovskites made by the combustion synthesis technique. / Chou, Yeong Shyung; Stevenson, Jeffrey W.; Armstrong, Timothy R.; Pederson, Larry R.

In: Journal of the American Ceramic Society, Vol. 83, No. 6, 2000, p. 1457-1464.

Research output: Contribution to journalArticle

Chou, Yeong Shyung ; Stevenson, Jeffrey W. ; Armstrong, Timothy R. ; Pederson, Larry R. / Mechanical properties of La1-xSrxCo0.2Fe0.8O3 mixed-conducting perovskites made by the combustion synthesis technique. In: Journal of the American Ceramic Society. 2000 ; Vol. 83, No. 6. pp. 1457-1464.
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