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Journal of Materials Science

, Volume 42, Issue 15, pp 6267–6273 | Cite as

Grain boundary analysis and secondary phases in LaCoO3-based perovskites

  • Per Erik Vullum
  • Antonius T. J. van Helvoort
  • Randi Holmestad
  • Johann Mastin
  • Øystein E. Andersen
  • Mari-Ann Einarsrud
  • Tor Grande
Article

Abstract

Secondary phases and grain boundaries in LaCoO3 and La0.7Sr0.3CoO3−δ ceramics have been studied by transmission electron microscopy. Both materials contained small amounts of grains of a secondary phase; the face centered cubic spinel structure Co3O4, located at triple junctions. These grains were agglomerates of several smaller grains. High resolution electron microscopy combined with annular dark field scanning transmission electron microscopy and electron energy loss spectroscopy were used to analyze the grain boundaries. In LaCoO3, the grain boundaries were sharp with stable compositions of La, Co and O across the boundaries. In La0.7Sr0.3CoO3−δ, a 1–2 nm thick intergranular layer between the grains was observed. This layer was rich in O and Co and deficient in Sr and La, compared to the nominal composition of the material.

Keywords

High Resolution Transmission Electron Microscopy Co3O4 High Resolution Transmission Electron Microscopy Electron Energy Loss Spectroscopy LaCoO3 

Notes

Acknowledgements

This work was supported by NTNU, strategic area of materials and The Research Council of Norway, grants no. 140553/420, 158517/431, and 153329/V30.

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Copyright information

© Springer Science+Business Media, LLC 2007

Authors and Affiliations

  • Per Erik Vullum
    • 1
  • Antonius T. J. van Helvoort
    • 1
  • Randi Holmestad
    • 1
  • Johann Mastin
    • 2
  • Øystein E. Andersen
    • 2
  • Mari-Ann Einarsrud
    • 2
  • Tor Grande
    • 2
  1. 1.Department of PhysicsNorwegian University of Science and TechnologyTrondheimNorway
  2. 2.Department of Materials Science and EngineeringNorwegian University of Science and TechnologyTrondheimNorway

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