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Ultrasensitive barocaloric material for room-temperature solid-state refrigeration.

Qingyong Ren1,2, Ji Qi3,4, Dehong Yu5

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Researchers discovered a significant barocaloric effect in ammonium iodide (NH4I) near room temperature. This finding, driven by pressure-induced phase transitions, could overcome obstacles in solid-state refrigeration applications.

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Area of Science:

  • Materials Science
  • Thermodynamics
  • Solid-State Physics

Background:

  • Solid-state refrigeration faces challenges due to high driving field requirements.
  • Barocaloric materials offer a promising alternative for efficient cooling technologies.

Purpose of the Study:

  • To investigate the barocaloric effect in inorganic ammonium iodide (NH4I).
  • To explore the potential of NH4I for practical solid-state refrigeration applications.

Main Methods:

  • Experimental characterization of barocaloric properties.
  • Neutron scattering techniques to analyze crystal structure and atomic dynamics.
  • Pressure-dependent measurements of phase transitions.

Main Results:

  • Observed a giant barocaloric effect in NH4I with entropy changes of ~71 J K⁻¹ kg⁻¹.
  • Demonstrated a dramatic pressure sensitivity of the phase transition temperature (dTt/dP ~0.79 K MPa⁻¹).
  • Achieved a broad temperature span of ~41 K under 80 MPa with a low driving pressure of ~40 MPa.

Conclusions:

  • A strong reorientation-vibration coupling mechanism underlies the high pressure sensitivity of the phase transition.
  • NH4I exhibits exceptional barocaloric properties, advancing the feasibility of practical barocaloric refrigeration.