Ferroelectric Thin Films of Bismuth-Containing Layered Perovskites: Part I, Bi4Ti3O12

Authors

  • Xiaofeng Du,

    1. Department of Materials Science and Engineering, University of Pennsylvania, Philadelphia, Pennsylvania 19104-6272
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      Member, American Ceramic Society.

  • I-Wei Chen

    1. Department of Materials Science and Engineering, University of Pennsylvania, Philadelphia, Pennsylvania 19104-6272
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    • *

      Member, American Ceramic Society.


  • B. A. Tuttle—contributing editor

  • Supported by the National Science Foundation under Grant No. DMR-97-96219. The use of facilities of the Laboratory for Research on the Structure of Matter at the University of Pennsylvania supported by NSF-MRSEC under Grant No. DMR-96-32598 is acknowledged.

Abstract

Ferroelectric thin films of bismuth-containing layered perovskite Bi4Ti3O12 have been fabricated by a metalorganic decomposition (MOD) method. Crack-free and crystalline films of ∼5000 Å thickness have been deposited on Pt/Ti/SiO2/Si substrates. Different heat treatments have been studied to investigate the nucleation and growth of perovskite Bi4Ti3O12 crystallites. If the same composition and final annealing temperature are used, films with different orientations are obtained by different heating schedules. These films show a large anisotropy in ferroelectric properties. Theoretical considerations are presented to suggest that nucleation control is responsible for texture and grain-size evolution. Moreover, the origin of the ferroelectric anisotropy is rooted in the two-dimensional nature of layered polarization.

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