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High-temperature creep of polycrystalline BaTiO3

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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.

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Authors and Affiliations

  1. Energy Technology Division, Argonne National Laboratory, 60439, Argonne, Illinois, USA

    E. T. Park

  2. Mechanical, Materials, and Aerospace Engineering Department, Illinois Institute of Technology, 60616, Chicago, Illinois, USA

    E. T. Park & P. Nash

  3. Army Materials Laboratory, 2800 Powder Mill Road, 20783, Adelphi, Maryland, USA

    J. Wolfenstine

  4. Energy Technology Division, Argonne National Laboratory, 60439, Argonne, Illinois, USA

    K. C. Goretta & J. L. Routbort

Authors
  1. E. T. Park
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  2. P. Nash
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  3. J. Wolfenstine
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  4. K. C. Goretta
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  5. J. L. Routbort
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Park, E.T., Nash, P., Wolfenstine, J. et al. High-temperature creep of polycrystalline BaTiO3. Journal of Materials Research 14, 523–528 (1999). https://doi.org/10.1557/JMR.1999.0075

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  • DOI: https://doi.org/10.1557/JMR.1999.0075

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