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Creep of Lanthanum Gallate

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Abstract

Strontium- and magnesium-doped lanthanum gallate (LSGM) was deliberately prepared to give A-site deficient nonstoichiometry with compositions (La0.9Sr0.1)z(Ga0.8Mg0.2)O3-δ (z = 1.0, 0.98, and 0.95). Creep tests in four-point bending for 950 °C < T < 1350 °C and 15 MPa < σ < 75 MPa in air demonstrated that all three compositions shared a common stress dependence, n= 1.49 ± 0.10, and a common apparent activation energy, Q = 426 ± 9 kJ/mol. Despite this agreement, the creep rates of the different compositions depended on grain size in different ways: p = 3.1 ± 0.2 for z = 0.98, and p = 1.9 ± 0.1 for z = 0.95. The measured apparent activation energy, Q, for creep is similar, though statistically significantly smaller, than that measured in another LSGM. Both are nearly twice as large as reported activation energies for cation impurity diffusion. The absolute magnitude of the creep rates, after correction for grain size, were 30 to 100 times slower than in another LSGM of similar composition.

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Authors and Affiliations

  1. Ceramics Division, National Institute of Standards & Technology, Gaithersburg, 20899, Maryland, USA

    William E. Luecke

  2. Metals & Ceramics Division, Oak Ridge National Laboratory, Oak Ridge, 37831, Tennessee, USA

    Timothy R. Armstrong

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  1. William E. Luecke
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  2. Timothy R. Armstrong
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Correspondence to William E. Luecke.

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Luecke, W.E., Armstrong, T.R. Creep of Lanthanum Gallate. Journal of Materials Research 17, 532–541 (2002). https://doi.org/10.1557/JMR.2002.0075

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