Accession Number : ADA622611


Title :   Domain Wall Evolution in Phase Transforming Oxides


Descriptive Note : Final rept. 18 Aug 2009-17 Nov 2013


Corporate Author : FLORIDA UNIV GAINESVILLE


Personal Author(s) : Jones, Jacob L


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a622611.pdf


Report Date : 14 Jan 2015


Pagination or Media Count : 13


Abstract : 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.


Descriptors :   *DOMAIN WALLS , *FERROELECTRIC MATERIALS , *IN SITU ANALYSIS , *OXIDES , *PHASE TRANSFORMATIONS , *X RAY DIFFRACTION , ANISOTROPY , COUPLING(INTERACTION) , DEFECTS(MATERIALS) , ELECTRIC FIELDS , PEROVSKITES , PIEZOELECTRIC EFFECT , PLANAR STRUCTURES , POLARIZATION , POLYCRYSTALLINE , SINGLE CRYSTALS , STRUCTURAL PROPERTIES , SUBSTRATES , SYNTHESIS(CHEMISTRY) , THIN FILMS


Subject Categories : Polymer Chemistry
      Crystallography
      Electricity and Magnetism
      Nuclear Physics & Elementary Particle Physics


Distribution Statement : APPROVED FOR PUBLIC RELEASE