X-ray fluorescence holography under high-pressure conditions.

Area of Science:

• Materials Science
• Condensed Matter Physics
• Crystallography

Background:

• Investigating material properties under extreme conditions is crucial for fundamental science and technological applications.
• Understanding the behavior of strontium titanate (SrTiO3) under pressure is key to its potential uses.

Purpose of the Study:

• To apply X-ray fluorescence holography (XFH) under high-pressure conditions for the first time.
• To investigate the local atomic structure around Sr atoms in single-crystal SrTiO3 as a function of pressure.

Main Methods:

• Integration of XFH with a diamond anvil cell (DAC) for high-pressure experiments.
• Optimization of the experimental setup using nano-polycrystalline diamond anvils and a yttrium filter to reduce background noise.
• Measurement of Sr Kα holograms and Kossel lines at pressures up to 13.3 GPa.

Main Results:

• Successful acquisition of Sr Kα holograms and Kossel line shifts at high pressures.
• Reconstruction of real-space images revealing pressure-induced changes in the 3D local atomic structure.
• Determination of lattice constant variations with applied pressure.

Conclusions:

• Demonstration of the feasibility of XFH for in-situ high-pressure structural analysis.
• XFH provides a novel method for visualizing element-specific local atomic structure evolution under pressure.
• This technique opens new avenues for studying materials under extreme conditions.