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Sample heating above 1400 K in a diamond anvil cell.

Min Cao¹, Dawei Jiang¹, Muyun Han¹

¹State Key Laboratory of Superhard Materials, Jilin University, Changchun 130012, China.

The Review of Scientific Instruments

|December 12, 2023

Summary

A novel composite heating gasket enables direct sample heating within diamond anvil cells, creating a uniform temperature field for high-pressure research. This advancement improves in situ measurements at extreme temperatures.

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$Synthesis and Microdiffraction at Extreme Pressures and Temperatures$

Synthesis and Microdiffraction at Extreme Pressures and Temperatures

Published on: October 7, 2013

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.