Mechanical Properties of Magnesia-Doped Lanthanum Chromite versus Temperature |
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| Authors: | Charles S Montross Harumi Yokokawa Masayuki Dokiya Lambert Bekessy |
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| Affiliation: | National Institute for Materials and Chemical Research, Tsukuba, Ibaraki 305 Japan;Department of Mining and Metallurgy, University of Queensland, Brisbane, Queensland 4072, Australia |
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| Abstract: | 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 0.9 Mg 0.1 )O3 were measured from 25° to 1000deg;C in the as-fired reduced state and after oxidation. The as-fired samples showed a peak in toughness of approximately 3.9 MPa.m1/2 at 125deg;C which decreased to approximately 1.4 MPa.m1/2 at 600deg;C and 2.8 MPa.m1/2 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. |
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