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Neutron Larmor diffraction on powder samples.

Thomas Keller1,2, Piotr Fabrykiewicz3, Radosław Przeniosło3

  • 1Max Planck Institute for Solid State Research, Stuttgart, Germany.

Journal of Applied Crystallography
|February 13, 2020
PubMed
Summary
This summary is machine-generated.

A new resolution effect in neutron Larmor diffraction (LD) from small-angle neutron scattering (SANS) was discovered. This study presents a method to correct LD data for SANS, improving momentum resolution for powder samples.

Keywords:
neutron Larmor diffractionneutron spin–echopolycrystalline samplespowder diffraction

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Area of Science:

  • Neutron scattering techniques
  • Materials science
  • Crystallography

Background:

  • Neutron Larmor diffraction (LD) is a powerful technique for studying magnetic structures.
  • Small-angle neutron scattering (SANS) can affect the resolution of LD measurements, particularly for powder samples.
  • Existing LD methods may not fully account for SANS-induced distortions.

Purpose of the Study:

  • To identify and characterize a previously unrecognized resolution effect in neutron Larmor diffraction (LD).
  • To develop and demonstrate a method for correcting LD data for parasitic small-angle neutron scattering (SANS).
  • To improve the momentum resolution of LD measurements for polycrystalline and powder samples.

Main Methods:

  • Utilized neutron Larmor diffraction (LD) to probe sample structure.
  • Employed spin-echo small-angle neutron scattering (SESANS) to accurately quantify parasitic SANS.
  • Developed a data analysis procedure to correct LD data for SANS effects.
  • Validated the method using α-Fe2O3 powder samples.

Main Results:

  • Identified a resolution degradation in LD due to SANS, significant for powder samples.
  • Demonstrated that SESANS can accurately measure the parasitic SANS.
  • Successfully corrected LD data for SANS, leading to improved momentum resolution.
  • Obtained d-spacing results consistent with synchrotron X-ray diffraction data.

Conclusions:

  • SANS introduces a significant resolution effect in neutron Larmor diffraction for powder samples.
  • The combination of LD and SESANS, with the proposed correction method, provides accurate structural information.
  • This work enhances the reliability and precision of neutron Larmor diffraction for materials analysis.