Sample heating above 1400 K in a diamond anvil cell

Area of Science:

• High-pressure experimental physics
• Materials science
• Geophysics

Background:

• Sample heating in diamond anvil cells is crucial for high-pressure research.
• Existing methods face challenges in achieving uniform temperatures and preventing diamond oxidation.
• Developing advanced heating techniques is essential for accurate in situ measurements.

Purpose of the Study:

• To introduce a new internal resistance heating technique using a composite heating gasket.
• To demonstrate the effectiveness of this technique in creating a uniform temperature field.
• To assess its performance for high-temperature, high-pressure experiments.

Main Methods:

• Fabrication of a composite heating gasket by integrating an annular heater into the sample chamber.
• In situ temperature field characterization within the diamond anvil cell.
• Testing heating performance at temperatures exceeding 1400 K.

Main Results:

• The composite heating gasket provides a quasi-uniform temperature field within the sample chamber.
• The design minimizes diamond oxidation and allows direct spectroscopic measurements.
• Stable heating performance was achieved above 1400 K.
• A significant temperature zone (120-170 μm) with minimal temperature variation was observed.

Conclusions:

• The composite heating gasket is a simple, repeatable, and effective method for internal resistance heating.
• It significantly advances in situ measurements in diamond anvil cells under high pressure and temperature.
• This technique offers a more uniform temperature field, crucial for accurate scientific investigations.