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Related Experiment Videos

Structure and microstructure of hexagonal Ba3Ti2RuO9 by electron diffraction and microscopy.

Christian Maunders1, Joanne Etheridge, Natasha Wright

  • 1School of Physics and Materials Engineering, Building 69, Monash University, Victoria 3800, Australia. christian.maunders@spme.monash.edu.au

Acta Crystallographica. Section B, Structural Science
|March 18, 2005
PubMed
Summary
This summary is machine-generated.

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Barium titanate ruthenium oxide (Ba(3)Ti(2)RuO(9)) exhibits a non-centrosymmetric crystal structure, confirmed by electron diffraction. This structure arises from ordered titanium and ruthenium atoms, impacting its microstructure.

Area of Science:

  • Materials Science
  • Solid-State Chemistry
  • Crystallography

Background:

  • Hexagonal barium titanate (BaTiO(3)) serves as a parent compound for related structures.
  • Understanding the crystal structure and microstructure of complex oxides is crucial for their applications.

Purpose of the Study:

  • To refine the crystal structure of Ba(3)Ti(2)RuO(9) using advanced electron microscopy and diffraction techniques.
  • To investigate the microstructure, including grain boundaries and stacking faults, of Ba(3)Ti(2)RuO(9).

Main Methods:

  • Convergent-beam electron diffraction (CBED) was employed to determine the space group.
  • High-resolution electron microscopy (HREM) was used to observe microstructural features.
  • Powder X-ray diffraction (XRD) provided lattice parameter measurements.

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Main Results:

  • The space group of Ba(3)Ti(2)RuO(9) was identified as the non-centrosymmetric P6(3)mc, differing from the parent BaTiO(3).
  • Titanium (Ti) and ruthenium (Ru) atoms were found to occupy alternate octahedral sites along the c-axis, breaking centrosymmetry.
  • Lattice parameters were measured as a = 5.7056 ± 0.0005 Å and c = 14.0093 ± 0.0015 Å.
  • Coherent, low-strain grain boundaries and stacking faults were observed via HREM.

Conclusions:

  • The ordered arrangement of Ti and Ru atoms in Ba(3)Ti(2)RuO(9) leads to a non-centrosymmetric crystal structure.
  • Microstructural characterization reveals specific grain boundary types and defects, influencing material properties.