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A rapid-quench technique for multi-anvil high-pressure-temperature experiments.

Dmitry Bondar1, Hongzhan Fei1, Anthony C Withers1

  • 1Bayerisches Geoinstitut, University of Bayreuth, D95447 Bayreuth, Germany.

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|July 3, 2020
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Summary

A new rapid-quench technique was developed for high-pressure silicate melt studies. This method achieves significantly faster cooling rates, preventing sample alteration during glass formation.

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Area of Science:

  • Geochemistry
  • High-Pressure Experimental Petrology
  • Materials Science

Background:

  • Silicate melts are crucial for understanding Earth's interior.
  • Forming glass from melts requires rapid cooling to prevent crystallization.
  • Existing high-pressure apparatus have limited cooling rates, hindering glass formation.

Purpose of the Study:

  • To develop an improved rapid-quench technique for high-pressure, high-temperature experiments.
  • To extend the pressure and compositional range for creating silicate glasses.
  • To enable the study of silicate melts under a wider range of conditions.

Main Methods:

  • Development of a rapid-quench technique utilizing an external cooling system.
  • Implementation of a low thermal-inertia assembly within a multi-anvil apparatus.
  • Achieving cooling rates of 6000-7000 °C/s.

Main Results:

  • The developed technique significantly surpasses the cooling rates of conventional piston-cylinder (130 °C/s) and multi-anvil (650 °C/s) apparatus.
  • Successful quenching of silicate melts into glass was achieved over an extended pressure and compositional range.
  • Minimized sample alteration, including melt crystallization and volatile loss, during the quenching process.

Conclusions:

  • The novel rapid-quench technique is effective for preserving the quenched state of silicate melts.
  • This advancement allows for more accurate investigations into the properties of silicate melts at high pressures.
  • The technique opens new avenues for high-pressure research in solid Earth science and materials science.