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Elevated temperature deformation of fine-grained La0.9Sr0.1MnO3

Published online by Cambridge University Press:  31 January 2011

J. Wolfenstine ,
T. R. Armstrong ,
W. J. Weber ,
M. A. Boling-Risser ,
K. C. Goretta  and
J. L. Routbort
J. Wolfenstine
Affiliation:
Department of Chemical and Biochemical Engineering, University of California, Irvine, California 92717–2575
T. R. Armstrong
Affiliation:
Pacific Northwest Laboratory, P.O. Box 999, Richland, Washington 99352
W. J. Weber
Affiliation:
Pacific Northwest Laboratory, P.O. Box 999, Richland, Washington 99352
M. A. Boling-Risser
Affiliation:
Energy Technology Division, Argonne National Laboratory, Argonne, Illinois 60439–4838
K. C. Goretta
Affiliation:
Energy Technology Division, Argonne National Laboratory, Argonne, Illinois 60439–4838
J. L. Routbort
Affiliation:
Energy Technology Division, Argonne National Laboratory, Argonne, Illinois 60439–4838
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Abstract

Compressive creep behavior of fine-grained (5 μm) La0.9Sr0.1MnO3 with a relative theoretical density between 85 and 90% was investigated over the temperature range 1150–1300 °C in air. The fine grain size, brief creep transients, stress exponent close to unity, and absence of deformation-induced dislocations, suggested that the deformation was controlled by a diffusional creep mechanism. The activation energy for creep of La0.9Sr0.1MnO3 was 490 kJ/mole. A comparison of the activation energy for creep of La0.9Sr0.1MnO3 with existing diffusion and creep data for perovskite oxides suggested that the diffusional creep of La0.9Sr0.1MnO3 was controlled by lattice diffusion of the cations, either lanthanum or manganese.

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Articles
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Journal of Materials Research , Volume 11 , Issue 3 , March 1996 , pp. 657 - 662
Copyright
Copyright © Materials Research Society 1996

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