A resistively-heated dynamic diamond anvil cell (RHdDAC) for fast compression x-ray diffraction experiments at high...

Area of Science:

• Geophysics and Materials Science
• High-pressure physics
• Materials characterization

Background:

• Dynamic compression studies require precise control over pressure and temperature.
• Existing methods face limitations in achieving simultaneous high-pressure and high-temperature conditions with controlled compression rates.

Purpose of the Study:

• To present a novel resistively-heated dynamic diamond anvil cell (RHdDAC) setup.
• To enable dynamic compression of samples at high temperatures (up to 1400 K) and high pressures (∼130 GPa).
• To investigate the mechanical stability of materials and crystal structure under extreme conditions.

Main Methods:

• Utilized a piezoelectric actuator for precise pressure control.
• Incorporated internal heaters for achieving high temperatures.
• Employed time-resolved x-ray diffraction with synchrotron radiation and fast detectors for data collection.
• Tested metallic glass gaskets (FeSiB alloy) for mechanical stability.

Main Results:

• Successfully performed dynamic compression experiments up to 1400 K and ∼130 GPa.
• Examined the stability of metallic glass gaskets under simultaneous high-pressure/high-temperature conditions.
• Characterized crystal structures and compression behaviors of H₂O ice and (Mg, Fe)O ferropericlase.

Conclusions:

• The RHdDAC provides precise control over compression rates and tailored compression paths.
• The setup facilitates high-pressure, high-temperature research with excellent pressure resolution.
• Offers significant potential for future experiments under extreme conditions, including geophysics and materials science.