Investigation of nanodomain pattern and piezoelectric behavior of mixed phases in epitaxial BiFeO3 films

Hsin-Yi Kuo, Y. C. Shu*, H. Z. Chen, C. J. Hsueh, C. H. Wang, Ying-hao Chu

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

8 Scopus citations

Abstract

Mixed phases of rhombohedral and tetragonal ferroelectric variants have been recently observed to coexist through epitaxial constraints in bismuth ferrite films. They form stripe-like domain patterns with orientations closely parallel to the substrate edges and exhibit unusually large piezoelectric response in the stripe areas. Here a model is developed for explaining the peculiar domain orientations as well as the enhancement of piezoelectricity in the mixed phase. The former is determined by the relative magnitudes of elastic and depolarization energy, whereas the latter is ascribed to the strain-driven softening in dielectric stiffness. The predictions show the similar trend as those observed in recent experiments.

Original languageEnglish
Pages (from-to)3063-3071
Number of pages9
JournalJournal of the European Ceramic Society
Volume31
Issue number16
DOIs
StatePublished - 1 Dec 2011

Keywords

  • Bismuth ferrite
  • Domain pattern
  • Epitaxial film
  • Piezoelectricity

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