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High-temperature creep of polycrystalline BaTiO3

Published online by Cambridge University Press:  31 January 2011

E. T. Park ,
P. Nash ,
J. Wolfenstine ,
K. C. Goretta  and
J. L. Routbort
E. T. Park
Affiliation:
Energy Technology Division, Argonne National Laboratory, Argonne, Illinois 60439, and Mechanical, Materials, and Aerospace Engineering Department, Illinois Institute of Technology, Chicago, Illinois 60616
P. Nash
Affiliation:
Mechanical, Materials, and Aerospace Engineering Department, Illinois Institute of Technology, Chicago, Illinois 60616
J. Wolfenstine
Affiliation:
Army Materials Laboratory, 2800 Powder Mill Road, Adelphi, Maryland 20783
K. C. Goretta
Affiliation:
Energy Technology Division, Argonne National Laboratory, Argonne, Illinois 60439
J. L. Routbort
Affiliation:
Energy Technology Division, Argonne National Laboratory, Argonne, Illinois 60439
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Abstract

Compressive creep of dense BaTiO3 having linear-intercept grain sizes of 19.3–52.4 μm was investigated at 1200–1300 °C by varying the oxygen partial pressure from 102 to 105 Pa in both constant-stress and constant-crosshead-velocity modes. Microstructures of the deformed materials were examined by scanning and transmission electron microscopy. The stress exponent was ≈1, the grain-size dependence was ≈1/d2, and the activation energy was ≈720 kJ/mole. These parameters, combined with the microstructural observations (particularly grain displacement and absence of deformation-induced dislocations), indicated that the dominant deformation mechanism was grain-boundary sliding accommodated by lattice cation diffusion. Because of the absence of an oxygen partial pressure dependence, diffusion was probably controlled extrinsically.

Type
Articles
Information
Journal of Materials Research , Volume 14 , Issue 2 , February 1999 , pp. 523 - 528
Copyright
Copyright © Materials Research Society 1999

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References

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