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Measuring Spray Droplet Size from Agricultural Nozzles Using Laser Diffraction
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Size-strain separation in diffraction line profile analysis.

P Scardi1, M Ermrich2, A Fitch3

  • 1Department of Civil, Environmental and Mechanical Engineering, University of Trento, Trento, Italy.

Journal of Applied Crystallography
|June 14, 2018
PubMed
Summary
This summary is machine-generated.

This study compared laboratory and synchrotron methods for analyzing powder diffraction data. Both approaches can accurately determine crystallite size and microstrain, even with limited Bragg peaks, if data quality is high.

Keywords:
crystalline domain sizeline profile analysismicrostrainpowder diffraction

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Area of Science:

  • Materials Science
  • Crystallography
  • Analytical Chemistry

Background:

  • Accurate characterization of materials requires distinguishing between size and strain effects in diffraction patterns.
  • Ball-milled iron alloy powder serves as a suitable sample due to comparable domain size and strain broadening.

Purpose of the Study:

  • To evaluate the effectiveness of laboratory instruments versus synchrotron radiation beamlines for size-strain analysis.
  • To assess the impact of different experimental configurations on diffraction line profile analysis.

Main Methods:

  • A round-robin study involving multiple laboratory and synchrotron facilities.
  • Analysis of diffraction line profiles from an extensively ball-milled iron alloy powder.
  • Comparison of data quality and analysis outcomes across various instruments and configurations.

Main Results:

  • Synchrotron radiation beamlines offer optimal conditions for size-strain separation due to high energy, numerous Bragg peaks, and better data quality.
  • High-quality data from laboratory equipment, characterized by high counts and low background, can also yield reliable domain size and microstrain information.
  • The inclusion of diffuse scattering analysis, supported by synchrotron data, enhances the assessment of line broadening effects.

Conclusions:

  • Accurate separation of size and strain effects is achievable with both synchrotron and standard laboratory equipment.
  • High data quality (counts, background, intensity) is crucial for reliable microstructural analysis regardless of the instrument used.
  • The choice of instrument and experimental setup impacts the ease and accuracy of size-strain analysis, with synchrotron offering advantages for complex assessments.