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X-ray topography using the forward transmitted beam under multiple-beam diffraction conditions.

Y Tsusaka1, S Takeda2, H Takano1

  • 1Graduate School of Material Science, University of Hyogo, 3-2-1, Kouto, Kamigori, Hyogo 678-1297, Japan.

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Summary

This study presents a new X-ray topography technique for visualizing individual dislocations in single crystals. The method uses synchrotron X-rays and advanced detectors to achieve high resolution and density visualization.

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Area of Science:

  • Materials Science
  • Crystallography
  • Solid State Physics

Background:

  • Dislocation imaging is crucial for understanding crystal defects.
  • Traditional X-ray topography methods have limitations in resolution and speed.
  • Sapphire wafers are important single crystals in various technological applications.

Purpose of the Study:

  • To develop and demonstrate an advanced X-ray topography technique for high-resolution dislocation imaging.
  • To visualize individual dislocations in single crystals with high dislocation densities.
  • To analyze dislocation characteristics, including Burgers vector determination.

Main Methods:

  • Utilizing forward transmitted synchrotron X-ray beams.
  • Employing two-dimensional electronic arrays with 1 μm spatial resolution for detection.
  • Performing X-ray topography under multiple-beam diffraction conditions (two-wave and six-wave approximation).

Main Results:

  • X-ray topographs of a [0001] sapphire wafer showed no shape deformation or position shift of dislocation lines.
  • The technique successfully visualized individual dislocations in single crystals up to a density of 1 × 10^5 cm⁻².
  • Burgers vectors of individual dislocation lines were determined, similar to conventional Lang topographs.

Conclusions:

  • The developed X-ray topography technique offers high parallelism and sensitivity for precise dislocation visualization.
  • This method enables the study of individual dislocations in materials with high defect concentrations.
  • The technique is valuable for materials characterization and defect analysis in single crystals.