Atomic Structure of Mixed Ferroelectrics

Abstract

The purpose of this project is to determine the local atomic structure of mixed ferroelectric solids such as Pb(Mg1/3Nb2/3)O3 (PMN) by diffraction experiments, in order to obtain better understanding of the basis for their relaxor ferroelectric behavior. In particular we use pulsed neutron and synchrotron x-ray scattering measurements, and analyze the results in terms of the atomic pair distribution function. Anomalous x-ray scattering measurements were carried out for PMN at the Nb K-edge. The x-ray scattering intensity of an element depends strongly upon energy near the absorption edge, due to the anomalous dispersion effect. By making use of this phenomenon it is possible to differentiate contributions from different elements to the total scattering intensity. This technique is called the x-ray anomalous scattering study. The experiment was carried out at X-7A beamline of the National Synchrotron Light Source (NSLS) of Brookhaven National Laboratory.

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Document Details

Document Type
Technical Report
Publication Date
Jul 28, 1992
Accession Number
ADA254369

Entities

People

  • Takeshi Egami

Organizations

  • University of Pennsylvania

Tags

Communities of Interest

  • Advanced Electronics

DTIC Thesaurus Topics

  • Atomic Structure
  • Contracts
  • Diffraction
  • Distribution Functions
  • Engineering
  • Films
  • Light Sources
  • Materials
  • Materials Science
  • Measurement
  • Minority Groups
  • Scattering
  • Synchrotrons
  • Thin Films
  • X Ray Scattering
  • X Rays

Fields of Study

  • Physics

Readers

  • Acoustical Oceanography.
  • Materials Science and Engineering.
  • Nanofabrication and Microfabrication.