An electrical microheater technique for high-pressure and high-temperature diamond anvil cell experiments

Area of Science:

• Materials Science
• Geophysics
• Condensed Matter Physics

Background:

• High-pressure and high-temperature (HPHT) experiments are crucial for understanding material properties under extreme conditions.
• Traditional methods for achieving HPHT conditions in diamond anvil cells face limitations in temperature control and stability.
• The development of integrated heating elements is essential for advancing HPHT research.

Purpose of the Study:

• To fabricate and test small electrical heating elements on diamond anvil culets for HPHT experiments.
• To enable precise temperature control and temporal stability during high-pressure experiments on metals.
• To investigate the behavior of metals under extreme pressures and temperatures.

Main Methods:

• Lithographical fabrication of thin-film electrical heating elements onto the culets of designer diamond anvils.
• Utilizing the thin-film geometry for resistance to plastic deformation and efficient electrical heating.
• Performing high-pressure experiments using a diamond anvil cell with integrated heaters.
• Conducting experiments on gold samples at pressures up to 21 GPa and temperatures near 2000 K.

Main Results:

• Successfully fabricated robust, thin-film heating elements on diamond anvils.
• Achieved high temperatures (nearly 2000 K) with modest electrical currents (approx. 1 A).
• Demonstrated excellent control and temporal stability of sample temperature during experiments.
• Validated the technique through successful high-pressure experiments on gold samples up to 21 GPa.

Conclusions:

• The lithographically fabricated electrical heaters are effective for HPHT experiments on metals.
• This technique offers a significant advancement in achieving and controlling extreme conditions in diamond anvil cells.
• The developed method opens new avenues for studying material properties under relevant geological and industrial conditions.