Mechanical properties of magnesia-doped lanthanum chromite versus temperature

Journal Article · Sat Jul 01 00:00:00 EDT 1995 · Journal of the American Ceramic Society

DOI:https://doi.org/10.1111/j.1151-2916.1995.tb08902.x· OSTI ID:103617

Montross, C S; Yokokawa, Harumi; Dokiya, Masayuki ^[1]; Bekessy, L ^[2]

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1. National Institute for Materials and Chemical Research, Tsukuba, Ibaraki (Japan)
2. Univ. of Queensland, Brisbane (Australia). Dept. of Mining and Metallurgy

Magnesia-doped lanthanum chromite is a potential material for use in solid oxide fuel cells as an interconnector due to its resistance to oxidation and reduction. The strength and toughness of La(Cr{sub 0.9}Mg{sub 0.1})O{sub 3} were measured from 25 to 1,000 C in the as-fired reduced state and after oxidation. The as-fired samples showed a peak in toughness of approximately 3.9 MPa{center_dot}m{sup 1/2} at 125 C which decreased to approximately 1.4 MPa{center_dot}m{sup 1/2} at 600 C and 2.8 MPa{center_dot}m{sup 1/2} at room temperature. This peak in toughness is hypothesized to be due to the rhombohedral-to-orthorhombic phase transition by a toughening mechanism that is currently being investigated. The strength was also affected by the phase transition for both the as-fired reduced and the oxidized samples.

• Sponsoring Organization: USDOE
• OSTI ID: 103617
• Journal Information: Journal of the American Ceramic Society, Vol. 78, Issue 7; Other Information: PBD: Jul 1995
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
30 DIRECT ENERGY CONVERSION
LANTHANUM OXIDES
MECHANICAL PROPERTIES
THERMAL EXPANSION
PHASE STUDIES
OXIDATION
CHROMIUM OXIDES
MAGNESIUM OXIDES
SOLID ELECTROLYTE FUEL CELLS
MATERIALS
SAMPLE PREPARATION
AGING
AIR
FRACTURE PROPERTIES
CRYSTAL-PHASE TRANSFORMATIONS
ORTHORHOMBIC LATTICES
TRIGONAL LATTICES
X-RAY DIFFRACTION
CORROSION RESISTANCE