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Related Experiment Videos

Polymorphism in micro-, submicro-, and nanocrystalline NaNbO3.

Yosuke Shiratori1, Arnaud Magrez, Jürgen Dornseiffer

  • 1Institut für Elektronische Materialien, Institut für Festkörperforschung (IFF), Forschungszentrum Jülich GmbH, D-52425 Jülich, Germany. yo.shiratori@fz-juelich.de

The Journal of Physical Chemistry. B
|July 21, 2006
PubMed
Summary

Particle size significantly influences sodium niobate (NaNbO3) phase transformations. Smaller nanoparticles exhibit distinct crystal symmetries and cell volumes compared to larger, bulk-like structures.

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Area of Science:

  • Materials Science
  • Solid-State Chemistry
  • Nanotechnology

Background:

  • Sodium niobate (NaNbO3) is a perovskite material with potential applications in electronics and energy.
  • Understanding its phase behavior is crucial for tailoring its properties.
  • Particle size effects in nanomaterials can lead to unique structural and functional characteristics.

Purpose of the Study:

  • To investigate the impact of particle size on the crystal structure and phase transformations of NaNbO3 powders.
  • To synthesize NaNbO3 powders with controlled stoichiometry and varying particle sizes.
  • To elucidate the relationship between particle size, crystal symmetry, and cell volume.

Main Methods:

  • Microemulsion-mediated synthesis for controlled NaNbO3 powder preparation.

Related Experiment Videos

  • X-ray powder diffraction (XRD) for crystal structure analysis.
  • Raman spectroscopy and nuclear site group analysis for detailed structural characterization.

    • Main Results:

    • Coarsened NaNbO3 particles adopted the bulk orthorhombic Pbcm structure.
    • Submicron NaNbO3 powders showed orthorhombic Pmc2(1) symmetry with expanded cell volumes.
    • Fine NaNbO3 particles (<70 nm) exhibited orthorhombic Pmma symmetry with a compact pseudocubic cell.

    Conclusions:

    • Particle size is a critical factor governing the phase transformation and crystal symmetry of NaNbO3.
    • Distinct structural phases emerge at the nanoscale, deviating from bulk behavior.
    • The findings suggest a size-dependent phase transformation mechanism in NaNbO3.