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Related Experiment Videos

Cation self-diffusion in LaCoO(3) and La(2)CoO(4) studied by diffusion couple experiments.

Marian Palcut1, Kjell Wiik, Tor Grande

  • 1Department of Materials Science and Engineering, Norwegian University of Science and Technology, 7491 Trondheim, Norway.

The Journal of Physical Chemistry. B
|February 14, 2007
PubMed
Summary

The reaction between La2O3 and CoO forms LaCoO3, with cobalt diffusion being the rate-limiting step. This diffusion rate depends on oxygen partial pressure and temperature, impacting material synthesis.

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Area of Science:

  • Solid-state chemistry
  • Materials science
  • Chemical kinetics

Background:

  • Lanthanum cobaltate (LaCoO3) is a perovskite oxide with potential applications in catalysis and electronics.
  • Understanding the formation mechanisms and diffusion processes is crucial for optimizing its synthesis and performance.

Purpose of the Study:

  • To investigate the reaction kinetics between La2O3 and CoO at high temperatures.
  • To determine the rate-limiting diffusion species and their mobility within the LaCoO3 phase.
  • To explore the influence of oxygen partial pressure on the reaction and diffusion.

Main Methods:

  • High-temperature solid-state reaction experiments.
  • Use of platinum markers to track diffusion paths.
  • Analysis of reaction product phases and growth kinetics.

Related Experiment Videos

  • Application of the parabolic rate law to determine diffusion coefficients.

    • Main Results:

    • Formation of single-phase LaCoO3 at high oxygen partial pressures, following parabolic growth kinetics.
    • Cobalt (Co3+) diffusion was identified as the dominant transport mechanism in LaCoO3.
    • An activation energy of (250 +/- 10) kJ mol-1 was determined for Co3+ diffusion.
    • Diffusion coefficient of Co3+ decreased with decreasing oxygen partial pressure.
    • Formation of La2CoO4 at low oxygen partial pressures, with estimated diffusion coefficients for Co cations.

    Conclusions:

    • The synthesis of LaCoO3 is controlled by Co3+ diffusion, which is sensitive to oxygen partial pressure.
    • A correlation between cation diffusion and melting point was observed in LnBO3 oxides.
    • The findings provide insights into the solid-state reaction mechanisms of perovskite oxides.