Pressure Distribution Measurements in Fixed-Anvil High-Pressure Cells

Area of Science:

• Materials Science
• Spectroscopy
• High-Pressure Physics

Background:

• Diamond anvil cells (DACs) are crucial for high-pressure research.
• Accurate pressure determination within DACs is essential for material studies.
• Previous methods for pressure mapping in DACs have limitations.

Purpose of the Study:

• To develop and demonstrate a method for calculating pressure in selected microsections of materials within DACs.
• To visualize pressure distribution across diamond anvil microsections.
• To investigate pressure gradients in diamond anvil cells.

Main Methods:

• Absorption spectra of materials were measured using diamond-anvil high-pressure cells.
• Pressure-sensitive absorption bands were analyzed.
• Shifts in absorption peaks were correlated with applied pressure.
• Contour diagrams were generated to illustrate pressure distribution.

Main Results:

• A method was established to calculate the pressure of specific microsections based on spectral shifts.
• Parabolic decreases in pressure from the center to the edge of diamond anvils were observed and visualized.
• The technique allows for detailed pressure mapping within the sample area.

Conclusions:

• The described spectroscopic method enables precise pressure calculation and mapping in DACs.
• Understanding pressure gradients is vital for interpreting high-pressure experimental results.
• This technique provides valuable insights into the mechanical behavior of materials under extreme pressure conditions.