In situ temperature measurements through i-anvils in diamond anvil cells

Area of Science:

• Materials Science
• Geophysics
• High-Pressure Physics

Background:

• Diamond anvil cells (DACs) are crucial for studying materials under extreme pressures and temperatures.
• Accurate in situ temperature measurement within DACs is essential for reliable experimental data.
• Current temperature sensing methods in DACs have limitations in precision and placement.

Purpose of the Study:

• To develop and validate a new in situ temperature sensing capability for diamond anvil cells (DACs).
• To assess the reliability and accuracy of intelligent anvils (i-anvils) as temperature sensors.
• To establish reproducible temperature-current relationships for i-anvils.

Main Methods:

• Fabrication of i-anvils by implanting B and/or C ions into diamonds to create subsurface sensors.
• Integration of i-anvils into two types of DACs for high-pressure and high-temperature experiments.
• Calibration of i-anvil sensors against thermocouples and known phase transitions of calibration standards up to 900°C and 6 GPa.

Main Results:

• Demonstrated reproducible current variation with temperature in i-anvils.
• Achieved in situ temperature measurements with an accuracy better than 1 degree Celsius.
• Validated the performance of i-anvils as reliable temperature sensors in DACs under experimental conditions.

Conclusions:

• Intelligent anvils (i-anvils) represent a significant advancement for in situ temperature monitoring in DACs.
• The developed i-anvil sensors are highly sensitive and accurate for high-pressure research.
• This technology enhances the precision and reliability of experiments conducted in diamond anvil cells.