Shadowing and absorption corrections of high-pressure powder diffraction data: toward accurate electron-density...

Area of Science:

• Crystallography
• Materials Science
• High-Pressure Physics

Background:

• Powder diffraction is crucial for analyzing materials under extreme conditions.
• Diamond-anvil cells (DACs) enable high-pressure studies but introduce complexities like beam shadowing.
• Accurate data collection is essential for reliable interpretation of diffraction patterns.

Purpose of the Study:

• To develop and describe methods for correcting primary beam and reflection shadowing in powder diffraction data.
• To provide a general procedure applicable to various sample environments and detector types.
• To optimize data collection strategies for high-pressure experiments using DACs.

Main Methods:

• Detailed description of shadowing correction procedures for point and area detectors.
• Application of corrections to data collected with samples enclosed in DACs.
• Analysis of quadrature effects in numerical integration for correction accuracy.

Main Results:

• Established a method to account for shadowing effects in powder diffraction data.
• Demonstrated applicability to diverse sample containers and diffractometers.
• Provided a framework for optimizing DAC positioning and sample rotation to mitigate preferred-orientation and particle-size effects.

Conclusions:

• The developed shadowing correction methods enhance the accuracy of high-pressure powder diffraction data.
• The procedures facilitate optimized data collection, leading to improved resolution and analysis.
• This work supports more reliable characterization of materials under extreme pressures.