High Temperature Protonic Conductors by Melt Growth

Abstract

This report results from a contract tasking Universidad de Sevilla as follows: The objective of the proposed research is to produce single crystal and multiphase ceramic materials of BaCe1-xNdxO3-a and Ba3(CaNb2)O9 that exhibit high temperature protonic conductance and superior mechanical properties at elevated temperatures. Ba3(CaNb2)O9 material systems will be examined across a broad compositional, and therefore microstructural range, that includes but is not limited to additions of Ga, Nd, and Ta. Characterization will use both Scanning electron microscopy (SEM) and Transmission electron microscopy (TEM). The mechanical behavior BaCe1-xNdxO3-a (x=0 to 0.2) and Ba3(CaNb2)O9 ceramics in the elastic, brittle and plastic regime will be studied over a range of temperatures to 1300 C. Impedance spectroscopy will be used to study mass transport of charged particles (protonic conductance). The spatial variations of compositions in BaCe1-xNdxO3-a and Ba3(CaNb2)O9 following high temperature wet atmosphere treatment will be measured using a variety of techniques based on the nuclear microprobe.

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Document Details

Document Type
Technical Report
Publication Date
May 28, 2003
Accession Number
ADA433596

Entities

People

  • Julian M. Fernandez

Organizations

  • University of Seville

Tags

Communities of Interest

  • Advanced Electronics
  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Crystal Structure
  • Crystals
  • Diffraction
  • Electron Microscopy
  • Electrons
  • Heat Energy
  • High Resolution
  • High Temperature
  • Materials
  • Measurement
  • Mechanical Properties
  • Microscopes
  • Microscopy
  • Scanning Electron Microscopy
  • Single Crystals
  • Stresses
  • Transmission Electron Microscopy

Fields of Study

  • Materials science

Readers

  • Materials Science and Engineering.
  • Reinforced Composite Materials
  • Thin Film Deposition Science.

Technology Areas

  • Microelectronics