MRS Proceedings

Table of Contents - Volume  1199  - Symposium F –Multiferroic and Ferroelectric Materials  

Editors : A. Gruverman, C.J. Fennie, I. Kunishima, B. Noheda, T.W. Noh

Articles

Structural Response of BaTiO3/CaTiO3 Superlattice to Applied Electric Fields

2009 MRS Fall Meeting.

Ji Young Joa1, Rebecca Sichela2, Ho Nyung Leea3, Eric Dufresnea4 and Paul Evansa5

a1 cycho@wisc.edu, University of Wisconsin-Madison, Madison, Wisconsin, United States

a2 sichel@wisc.edu, University of Wisconsin-Madison, Madison, Wisconsin, United States

a3 hnlee@ornl.gov, Oak Ridge National Laboratory, Oak Ridge, Tennessee, United States

a4 dufresne@aps.anl.gov, Argonne National Laboratory, Advanced Photon Source, Argonne, Illinois, United States

a5 evans@engr.wisc.edu, University of Wisconsin-Madison, Madison, Wisconsin, United States

Abstract

The structural response of a ferroelectric BaTiO3/dielectric CaTiO3 superlattice to the bipolar applied electric field was studied using time-resolved x-ray microdiffraction. Structural results were compared to the polarization-electric field hysteresis curve obtained from electrical measurements. The superlattice x-ray reflections were found to have a broad distribution of intensity in reciprocal space under applied electric fields exceeding the nominal coercive electric field. The broad distribution of the lattice constant at high electric fields is compared with a model in which the constituent layers of the superlattice have different coercive fields for the polarization switching.

(Received December 16 2009)

(Accepted March 29 2010)

Key Words

  • x-ray diffraction (XRD);
  • ferroelectricity;
  • piezoresponse
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