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Diamond anvil cell with double coaxial chambers.

Dawei Jiang1, Yang Gao2, Min Cao1

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

The Review of Scientific Instruments
|January 1, 2022
PubMed
Summary

This study introduces a novel diamond anvil cell (DAC) with isolated chambers, preventing chemical reactions between samples and pressure calibration materials (PCMs). This design ensures accurate pressure calibration under extreme conditions.

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Area of Science:

  • High-pressure physics
  • Materials science
  • Geophysics

Background:

  • Pressure calibration in diamond anvil cells (DACs) typically involves mixing pressure calibration materials (PCMs) with samples.
  • Chemical reactions between samples and PCMs at extreme conditions (high pressure, high temperature) cause calibration errors and sample contamination.

Purpose of the Study:

  • To develop a new DAC design that isolates PCMs from samples, preventing undesired chemical reactions.
  • To enable accurate pressure calibration in DACs without compromising sample integrity.

Main Methods:

  • Design and implementation of a novel DAC with double coaxial pressure chambers (sample and PCM chambers).
  • Experimental testing of the double-chamber DAC under varying conditions (room temperature to 634 K, below 20 GPa).
  • Analysis of pressure correlations between the two chambers based on geometric parameters and pressure transmitting media.

Main Results:

  • The double-chamber DAC effectively isolates the sample from the PCM.
  • When geometric parameters are consistent and chamber diameter difference is <10 µm, pressure in both chambers shows minimal dependence on the pressure transmitting medium's state.
  • Accurate pressure calibration of the sample chamber is achievable using the PCM chamber's pressure readings.

Conclusions:

  • The novel double-chamber DAC design successfully prevents sample-PCM interactions.
  • This setup provides reliable pressure calibration for samples under high pressure and temperature conditions below 20 GPa and 634 K.
  • The new DAC design offers a significant improvement over single-chamber DACs for accurate and contamination-free high-pressure research.