Analysis of the Atomic-Scale Defect Chemistry at Interfaces in Fluorite Structured Oxides by Electron Energy Loss Spectroscopy

Abstract

Gd(3+) doped Ce oxides are a major candidate for use as the electrolyte in solid oxide fuel cells operating at ^ 500 deg C. Here, the effect of the atomic structure on the local electronic properties, i.e., oxygen coordination and cation valence, at grain boundaries in the fluorite structured Gd(0.2)Ce(0.8)O(2-x) ceramic electrolyte is investigated by a combination of atomic resolution Z-contrast imaging and electron energy loss spectroscopy (EELS) in the scanning transmission electron microscope (STEM). In particular, EELS analyses from grain boundaries reveals a complex interaction between segregation of the dopant (Gd(3+)), oxygen vacancies and the valence state of Ce. These results are similar to observations from fluorite-structured Yttria-Stabilized Zirconium (YSZ) bicrystal grain boundaries.

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Document Details

Document Type
Technical Report
Publication Date
Nov 01, 2001
Accession Number
ADP012246

Entities

People

  • N. D. Browning
  • T. J. Mazanec
  • Y. Ito
  • Y. Lei

Organizations

  • Northern Illinois University

Tags

Communities of Interest

  • Energy and Power Technologies
  • Space

DTIC Thesaurus Topics

  • Acquisition
  • Atomic Structure
  • Chemistry
  • Crystal Structure
  • Detectors
  • Electron Energy
  • Electrons
  • Energy
  • Energy Levels
  • Grain Boundaries
  • Illinois
  • Materials
  • Materials Science
  • Nanocomposites
  • Physics
  • Spectra
  • Universities

Fields of Study

  • Materials science

Readers

  • Materials Science and Engineering.
  • Nanoscale Plasmonic Nanotechnology
  • Surface Engineering/Surface Coating Technology.

Technology Areas

  • Biotechnology
  • Microelectronics
  • Microelectronics - Graphene