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Crystal bending in triple-Laue X-ray interferometry. Part II. Phase-contrast topography.

E Massa1, G Mana1,2, C P Sasso1

  • 1INRIM, Istituto Nazionale di Ricerca Metrologica, Strada delle Cacce 91, 10135 Torino, Italy.

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Summary

Researchers experimentally confirmed that X-ray interferometers detect crystal surface displacement. Opposite bending of the crystal, achieved through copper deposition, results in observable opposite strains, validating prior predictions.

Keywords:
bent crystalscrystal X-ray interferometrycrystal strainsmoiré imagesphase-contrast topographythin films

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Area of Science:

  • Crystallography
  • Materials Science
  • Optics

Background:

  • Previous work studied triple-Laue X-ray interferometers with cylindrically bent crystals.
  • Theoretical predictions suggested phase-contrast topography reveals inner crystal surface displacement fields.
  • Opposite crystal bending was hypothesized to induce opposite (compressive/tensile) strains.

Purpose of the Study:

  • To experimentally verify the prediction that X-ray interferometers detect crystal surface displacement.
  • To confirm that opposite crystal bending leads to opposite strain observations.

Main Methods:

  • Utilized a triple-Laue X-ray interferometer setup.
  • Employed cylindrical bending of the splitting or recombining crystal.
  • Induced opposite crystal bending by depositing copper on alternating sides of the crystal.
  • Observed strain fields using phase-contrast topography.

Main Results:

  • Experimental results confirmed the prediction of strain detection via phase-contrast topography.
  • Opposite copper deposition on the crystal sides resulted in observable opposite strains.
  • The interferometer successfully detected the displacement field of the inner crystal surfaces.

Conclusions:

  • The experimental findings validate the theoretical predictions regarding X-ray interferometers and strain detection.
  • Phase-contrast topography in bent-crystal X-ray interferometers is a viable method for observing surface displacement and strain.
  • Controlled surface modification, like copper deposition, can be used to induce and study strain in crystalline materials.