Browsing by Author "Shu, Y. C."

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Domain pattern and piezoelectric response across polymorphic phase transition in strained bismuth ferrite films
(2010-12-13)
Kuo, H. Y.
;
Shu, Y. C.
;
Chen, H. Z.
;
Hsueh, C. J.
;
Wang, C. H.
A model is developed to investigate the domain pattern and piezoelectric response across the polymorphic phase transition in strained epitaxial bismuth ferrite films. The orientations of stripelike pattern of the mixed rhombohedral and tetragonal phases are predicted as the consequence of competition between elastic and depolarization energies. The abnormally large piezoelectric response is attributed to the strain-driven softening in dielectric stiffness. The results are in good agreement with recent experimental observations and provide a guidance for developing similar strain-driven polymorphic phase transition in other related perovskite material systems. (C) 2010 American Institute of Physics. [doi:10.1063/1.3525926]
Investigation of nanodomain pattern and piezoelectric behavior of mixed phases in epitaxial BiFeO(3) films
(2011-12-01)
Kuo, H. Y.
;
Shu, Y. C.
;
Chen, H. Z.
;
Hsueh, C. J.
;
Wang, C. H.
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. (C) 2011 Elsevier Ltd. All rights reserved.
Investigation of nanodomain pattern and piezoelectric behavior of mixed phases in epitaxial BiFeO3 films
(2011-12-01)
Kuo, H. Y.
;
Shu, Y. C.
;
Chen, H. Z.
;
Hsueh, C. J.
;
Wang, C. H.
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. (C) 2011 Elsevier Ltd. All rights reserved.