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Correlation Between Microstructural Evolution and Magnetocaloric Response in Suction-Cast MnCoGeB0.02 Alloy.

Rafael Suárez1,2, Israel Betancourt2, Jesús Arenas3

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|March 28, 2026
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Summary
This summary is machine-generated.

Subtle microstructural changes in MnCoGeB$_{0.02}$ alloys significantly impact magnetocaloric effect (MCE). Controlling phase proportions is key to optimizing MCE performance for magnetic cooling applications.

Keywords:
magnetocaloric effectmicrostructuresuction casting

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Magnetism

Background:

  • The magnetocaloric effect (MCE) is crucial for magnetic refrigeration technologies.
  • Interactions between magnetic and structural transitions can enhance MCE, leading to giant or colossal effects.
  • MnCoGe-based alloys are promising materials for MCE applications.

Purpose of the Study:

  • To investigate the influence of microstructural variations on the magnetocaloric behavior of MnCoGeB$_{0.02}$ alloy.
  • To understand the relationship between phase composition and magnetocaloric performance.
  • To explore the impact of fabrication methods on MCE.

Main Methods:

  • Fabrication of MnCoGeB$_{0.02}$ alloy samples using suction casting.
  • Analysis of conical samples using X-ray diffraction to determine phase composition.
  • Measurement of magnetic properties and magnetocaloric effect under a magnetic field change of 5.0 T.

Main Results:

  • X-ray diffraction revealed a coexistence of hexagonal and orthorhombic phases within the samples.
  • The proportion of these phases varied across different regions of the conical samples.
  • Magnetic entropy change (|ΔSPeak|) ranged from 12.3 to 6 Jkg-1K-1, demonstrating sensitivity to microstructural differences.

Conclusions:

  • Microstructural variations, even subtle ones arising from solidification during suction casting, significantly affect MCE performance.
  • Controlling the coexistence and proportion of hexagonal and orthorhombic phases is vital for optimizing magnetocaloric properties.
  • These findings highlight the importance of microstructural control for developing advanced MnCoGe-based magnetocaloric materials.