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Atomic resolution holography.

Kouichi Hayashi1

  • 1Institute for Materials Research, Tohoku University, Katahira, Sendai 980-8577, Japan.

Microscopy (Oxford, England)
|November 1, 2014
PubMed
Summary
This summary is machine-generated.

Atomic resolution holography, like X-ray fluorescence holography (XFH), provides 3D atomic images for local structure analysis. This technique reveals distortions and superlattices in materials like relaxor ferroelectrics.

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Area of Science:

  • Materials Science
  • Solid State Physics
  • Nanotechnology

Background:

  • Atomic resolution holography offers 3D atomic imaging for local structure analysis.
  • Established methods like XRD and XAFS provide limited local or long-range information.
  • Atomic resolution holography visualizes surrounding atoms and detects lattice distortions.

Purpose of the Study:

  • To demonstrate the capability of X-ray fluorescence holography (XFH) for detailed local structure analysis.
  • To investigate the atomic arrangements and distortions in relaxor ferroelectrics.
  • To elucidate the role of superstructures in the properties of Pb(Mg1/3Nb2/3)O3 (PMN).

Main Methods:

  • Utilizing X-ray fluorescence holography (XFH) for atomic imaging.
  • Analyzing Nb Kα and Pb Lα holograms to reconstruct 3D atomic structures.
  • Comparing holographic results with traditional X-ray diffraction and X-ray absorption fine structure.

Main Results:

  • XFH successfully visualized Pb and O atoms around Nb in PMN.
  • Reconstructed images revealed acute and obtuse rhombohedral structures.
  • Identified a body-centered 2a0 ×2a0 × 2a0 superlattice, confirming a rigid 3D network model.

Conclusions:

  • XFH provides unprecedented 3D medium-range local structure observation.
  • The identified superstructure is crucial for understanding the relaxor behavior of PMN.
  • Atomic resolution holography is a powerful tool for analyzing complex local distortions and atomic arrangements.