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Twinning and defects in N-Nb2O5.

F E Rohrer1, A K Larsson

  • 1Inorganic Chemistry, Stockholm University, S-106 91 Stockholm, Sweden.

Acta Crystallographica. Section B, Structural Science
|September 28, 2000
PubMed
Summary

Niobium oxide (N-Nb2O5) exhibits complex domain twinning, appearing as stacking faults and a second coherent twinning type. These features influence its crystal structure, similar to M-Nb2O5.

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Area of Science:

  • Solid State Chemistry
  • Materials Science
  • Crystallography

Background:

  • Niobium pentoxide (Nb2O5) exists in various polymorphs, each with distinct structural and electronic properties.
  • Understanding the crystallographic defects in N-Nb2O5 is crucial for predicting its behavior in applications.

Purpose of the Study:

  • To investigate the crystallographic structure and defect mechanisms in N-Nb2O5.
  • To characterize the domain twinning and its relationship to stacking faults.
  • To compare the observed structural features with other niobium oxide phases.

Main Methods:

  • Selected-area electron diffraction (SAED) was employed to analyze the crystallographic orientation and symmetry.
  • High-resolution transmission electron microscopy (HRTEM) provided atomic-scale imaging of structural features.
  • Analysis of lattice parameters and crystallographic angles (a, b, c, beta) for the C2/m phase.

Main Results:

  • N-Nb2O5 was confirmed to be domain twinned, with twin planes oriented perpendicular to the c* axis.
  • Observed domain twinning can be interpreted as stacking faults, indicating small domain sizes.
  • A secondary type of coherent twinning, at 90 degrees to other domain directions, was identified.
  • These domains are interconnected by regions with varying block sizes, resembling disordered arrangements in M-Nb2O5.

Conclusions:

  • N-Nb2O5 exhibits complex and multi-directional domain twinning, significantly impacting its crystal structure.
  • The presence of stacking faults and varied block sizes suggests potential for structural disorder.
  • Structural similarities to M-Nb2O5 highlight common defect mechanisms in niobium oxide polymorphs.

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