Near-infrared focused heating method for the rotational diamond anvil cell

Area of Science:

• Geophysics
• Mineral Physics
• High-Pressure Experimental Science

Background:

• Understanding deep Earth rheology requires high-pressure deformation experiments.
• Existing heating systems face limitations in achieving stable, homogeneous temperatures at extreme pressures.

Purpose of the Study:

• To introduce and validate a novel near-infrared focused heating system (IRrDAC) for rotational diamond anvil cell experiments.
• To demonstrate the system's capability in conducting annealing tests relevant to deep Earth conditions.

Main Methods:

• Development of the IRrDAC system for focused near-infrared heating.
• Annealing experiments on silver and antigorite using the IRrDAC system within a rotational diamond anvil cell at SPring-8 (BL47XU).
• Analysis of experimental results to confirm temperature control and material phase changes.

Main Results:

• Successful demonstration of silver melting and antigorite dehydration under high-pressure conditions.
• Confirmation of reproducible temperature-input power relationships, indicating precise thermal control.
• Validation of the IRrDAC system's capability for deformation experiments at lower mantle pressures.

Conclusions:

• The IRrDAC system enables homogeneous and stable high-temperature deformation experiments at lower mantle pressures.
• This technology is expected to significantly advance the study of deep Earth rheology.
• The system's performance was validated through successful annealing tests on silver and antigorite.