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Domain Wall Evolution in Phase Transforming Oxides

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Final rept. 18 Aug 2009-17 Nov 2013

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Phase-transforming materials enable environmental sensing and interaction critical to several military functions such as surveillance, navigation, threat identification, target acquisition, and missile guidance. Domain wall motion, or the planar defects separating regions of spontaneous polarization and strain, underlies the origin and evolution of coupling behavior. This project characterizes domain wall motion and domain configurations under driving forces e.g. changes in temperature and electric fields in an effort to 1 understand the underlying linkage between domain architectures and macroscopic properties, 2 explore new methods to control domain structures, and 3 identify unique domain configurations with novel properties. In the final year of this project, we have reported several new results related to the structure of lead-free materials based on Bi, Ba, Ca, Na and K. These results point towards local structures that are dramatically different than lead-based perovskites, the likely reason for lower effective properties. In PZT, we have used in situ diffraction measurements to help develop new constitutive models. We have also used in situ X-ray diffraction of PZT thin films in order to provide key insight into their synthesis and performance. Strong collaborations have continued with Argonne National Laboratories in X-ray scattering, as well as outreach and integration with the Army Research Laboratory.

Subject Categories:

  • Polymer Chemistry
  • Crystallography
  • Electricity and Magnetism
  • Nuclear Physics and Elementary Particle Physics

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