High-temperature experiments using a resistively heated high-pressure membrane diamond anvil cell
Zsolt Jenei1, Hyunchae Cynn, Ken Visbeck
1Lawrence Livermore National Laboratory, Livermore, California 94551, USA.
The Review of Scientific Instruments
|October 5, 2013
Summary
A new resistive heating method for membrane diamond anvil cells achieves high temperatures (1200 K) at high pressures (up to 185 GPa). This reliable setup enables homogenous sample heating for extended periods, crucial for materials science research.
Area of Science:
- High-pressure physics
- Materials science
- Geophysics
Background:
- Diamond anvil cells (DACs) are essential for simulating extreme pressures.
- Achieving and maintaining high, homogenous temperatures within DACs at high pressures remains a significant challenge.
- Existing heating methods often suffer from limited temperature ranges, poor uniformity, or short operational durations.
Purpose of the Study:
- To develop and validate a reliable, high-performance resistive heating method for membrane diamond anvil cells.
- To enable homogenous sample heating at high temperatures and pressures for extended experimental periods.
- To facilitate in situ measurements at extreme conditions relevant to geophysics and materials science.
Main Methods:
- Implementation of a resistive heating system using two mini coil heaters (Pt-Rh alloy) around the diamond anvils and gasket.
- Utilizing K-type thermocouples for precise temperature monitoring near the sample.
- Employing thermal insulation to maintain sample temperatures up to 1200 K while keeping the cell below 750 K.
- Integrating the heating system within a vacuum oven for oxidation prevention and heat loss reduction.
- Enabling remote operation suitable for synchrotron facilities.
Main Results:
- Demonstrated reliable generation of homogenous high temperatures (up to 1200 K) within the sample at high pressures.
- Successfully performed isothermal compression experiments to 100 GPa at 900 K and 185 GPa at 580 K.
- Conducted quasi-isobaric compression experiments at 95 GPa with temperatures exceeding 1000 K.
- Validated the setup's capability for in situ Raman spectroscopy and synchrotron X-ray diffraction.
Conclusions:
- The developed resistive heating method provides a reliable and high-performance solution for achieving extreme temperatures in membrane diamond anvil cells.
- This technique significantly enhances the capability for in situ studies of materials under combined high-pressure and high-temperature conditions.
- The system's remote operation and suitability for synchrotron facilities open new avenues for high-pressure research.
