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A universal metric for ferroic energy materials.

Ekkes Brück1, Hargen Yibole2, Lian Zhang3

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Philosophical Transactions. Series A, Mathematical, Physical, and Engineering Sciences
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Summary

Researchers propose a new metric, the coefficient of refrigerant performance, to evaluate hysteresis losses in magnetocaloric materials for magnetic refrigeration. This helps minimize energy losses in first-order phase transitions for practical applications.

Keywords:
Fe2Pcoefficient of refrigerant performancemagnetocaloricreversible cycle

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Area of Science:

  • Materials science
  • Thermodynamics
  • Solid-state physics

Background:

  • Intensive research on magnetocaloric effects near room temperature has advanced magnetic refrigeration towards practical applications.
  • First-order magnetocaloric materials are key candidates for multicaloric devices, but hysteresis in phase transitions poses challenges.
  • A universal metric is needed to quantify the detrimental effects of hysteresis in ferroic materials.

Purpose of the Study:

  • To introduce and define the coefficient of refrigerant performance (CRP) as a universal metric for evaluating ferroic materials.
  • To assess the impact of hysteresis on the efficiency of magnetic refrigeration systems.
  • To explore strategies for minimizing losses in first-order magnetocaloric materials.

Main Methods:

  • Proposed the coefficient of refrigerant performance (CRP) as a metric comparing reversible cycle work to positive refrigerant work.
  • Focused analysis on magnetocaloric materials and one barocaloric experiment due to data limitations.
  • Examined the influence of field-induced transitions and hysteresis on energy losses.

Main Results:

  • The coefficient of refrigerant performance (CRP) is presented as a universal metric for ferroic materials.
  • Adjusting field-induced transitions and hysteresis can significantly minimize losses in first-order materials.
  • The study highlights the importance of managing hysteresis for efficient magnetic refrigeration.

Conclusions:

  • The coefficient of refrigerant performance (CRP) offers a standardized way to evaluate materials for magnetic refrigeration.
  • Optimizing phase transitions and minimizing hysteresis are crucial for the practical application of first-order magnetocaloric materials.
  • Further research, particularly on electrocaloric materials, is needed to fully leverage multicaloric devices.