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Calorimetry is a technique used to measure the amount of heat involved in a chemical or physical process or to measure the heat transferred to or from a substance. The heat is exchanged with a calibrated and insulated device called the calorimeter. Calorimetry experiments are based on the assumption that there is no heat exchange between the insulated calorimeter and the external environment. The well-insulated calorimeters prevent the transfer of heat between the calorimeter and its external...
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Materials synthesis at terapascal static pressures.

Leonid Dubrovinsky1, Saiana Khandarkhaeva2,3, Timofey Fedotenko4

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|May 13, 2022
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Summary
This summary is machine-generated.

Scientists developed a new terapascal-regime method for extreme materials synthesis and analysis. This technique enabled the creation and characterization of rhenium nitride (Re7N3) under immense pressures.

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Area of Science:

  • Materials Science
  • High-Pressure Physics
  • Solid State Chemistry

Background:

  • Theoretical models predict unique material properties under extreme pressure and temperature.
  • Synthesizing and analyzing materials above 200 gigapascals (GPa) is challenging due to experimental complexity and lack of in situ methods.

Purpose of the Study:

  • To develop a methodology for static compression experiments in the terapascal (TPa) regime combined with laser heating.
  • To synthesize and characterize novel materials under extreme conditions previously inaccessible.

Main Methods:

  • Development of a laser-heated double-stage diamond anvil cell capable of reaching TPa pressures.
  • In situ synthesis of materials under static compression up to 900 GPa.
  • Synchrotron single-crystal X-ray diffraction for chemical and structural characterization of microcrystals.

Main Results:

  • Achieved static pressures of approximately 600 GPa and 900 GPa.
  • Successfully synthesized a rhenium-nitrogen alloy and the rhenium nitride phase Re7N3.
  • Demonstrated that Re7N3 is stable only under extreme compression conditions.

Conclusions:

  • The developed methodology enables experiments in the TPa regime, pushing the boundaries of high-pressure science.
  • This advancement extends the capabilities of in situ crystallography to unprecedented pressure levels.
  • The synthesis of Re7N3 under extreme conditions opens new avenues for exploring matter under the universe's most intense environments.