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Lluís Mañosa1, Antoni Planes2

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Summary
This summary is machine-generated.

Shape memory alloys exhibit giant mechanocaloric effects due to their structural transitions. Magnetic alloys show both elastocaloric and barocaloric effects, unlike non-magnetic ones.

Keywords:
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Area of Science:

  • Materials Science
  • Thermodynamics
  • Solid State Physics

Background:

  • Shape memory alloys (SMAs) are ferroic materials undergoing martensitic transitions.
  • These transitions involve lattice distortion and are sensitive to external fields, leading to mechanocaloric effects.
  • The nature of lattice distortion (shear vs. volume change) differentiates magnetic and non-magnetic SMAs.

Purpose of the Study:

  • To critically survey experimental data on elastocaloric and barocaloric effects in magnetic and non-magnetic SMAs.
  • To elucidate the relationship between material properties and observed caloric effects.
  • To provide a comprehensive overview for researchers in the field.

Main Methods:

  • Literature review and critical analysis of experimental data.
  • Comparison of elastocaloric and barocaloric effects in different SMA types.
  • Correlation of lattice distortion characteristics with external field responses.

Main Results:

  • Non-magnetic SMAs exhibit significant elastocaloric effects but negligible barocaloric effects due to shear-dominated transitions.
  • Magnetic SMAs, with transitions involving volume changes, show giant elastocaloric and barocaloric effects.
  • The sensitivity to stress and pressure is directly linked to the nature of the martensitic transformation.

Conclusions:

  • The type of lattice distortion in the martensitic transition dictates the response to mechanical and pressure stimuli.
  • Magnetic SMAs offer greater potential for caloric cooling applications due to their dual response.
  • Further research into SMA phase transitions can optimize materials for advanced thermal management.