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Microstructural studies on the reoxidation behavior of Nb-doped SrTiO3ceramics

Authors
Journal
Journal of the European Ceramic Society
0955-2219
Publisher
Elsevier
Publication Date
Volume
25
Issue
12
Identifiers
DOI: 10.1016/j.jeurceramsoc.2005.03.032
Keywords
  • Perovskites
  • Batio3And Titanates
  • Surfaces
  • Defects
  • Electron Microscopy
Disciplines
  • Chemistry

Abstract

Abstract We report several structural and chemical phenomena that were observed after high temperature annealing (1200 °C) of reduced 5 at.% Nb-doped polycrystalline SrTiO 3 in oxygen. The oxidation led to the formation of islands on the surface which, depending on the surface orientation of the grains, exhibit characteristic shapes, densities, and lateral directions. A correlation between grain orientation and tendency towards island formation was found. Structure and composition of the islands and the bulk were investigated by transmission electron microscopy. The bulk interior of the oxidized SrTiO 3 was found to exhibit compositional changes and Sr-rich secondary phases were found at the triple grain junctions. The results are discussed in terms of the defect chemistry of SrTiO 3.

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