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Experimental Methods for Investigation of Shape Memory Based Elastocaloric Cooling Processes and Model Validation

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Gd-Pt-In In Situ Composite Exhibiting Enhanced Relative Cooling Power and Broad Magnetocaloric Effect.

Aline A de Freitas¹, Jessica K P França¹, Walajhone O Pereira¹

¹Center for Sciences of Imperatriz, Federal University of Maranhão (UFMA), Imperatriz, MA 65900-410, Brazil.

|December 1, 2025

Summary

A new Gd-Pt-In composite shows excellent potential for magnetic refrigeration. Its dual magnetic transitions create a broad, effective cooling range, making it ideal for low-temperature applications.

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Chemical Vapor Deposition of an Organic Magnet, Vanadium Tetracyanoethylene

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Area of Science:

Materials Science
Condensed Matter Physics
Thermodynamics

Background:

Magnetic refrigeration utilizes the magnetocaloric effect (MCE) for efficient cooling.
Developing materials with broad MCE is crucial for practical magnetic refrigerators.
Gadolinium-based compounds are known for their magnetocaloric properties.

Purpose of the Study:

To synthesize and characterize a novel Gd-Pt-In composite material.
To investigate the magnetocaloric properties of the Gd-Pt-In composite.
To evaluate its suitability for low-temperature magnetic refrigeration.

Main Methods:

Arc melting synthesis technique.
Powder X-ray diffraction (PXRD), Scanning Electron Microscopy (SEM), and Energy-Dispersive X-ray Spectroscopy (EDS) for structural and compositional analysis.
Magnetic and specific heat measurements to determine magnetic transitions and magnetocaloric parameters.

Main Results:

The Gd-Pt-In composite consists of GdPtIn (76%) and GdPt (21%) phases.
Two successive ferromagnetic transitions were observed at 67 K and 63.5 K.
A broad magnetocaloric effect was achieved, with a maximum magnetic entropy change (-ΔSMmax) of 6 J/kg K and a relative cooling power (RCP) of 368 J/kg for a 50 kOe field change.

Conclusions:

The Gd-Pt-In composite exhibits significant magnetocaloric properties due to its successive magnetic transitions.
Its broad MCE and high RCP make it a promising material for low-temperature magnetic refrigeration.
The findings contribute to the search for advanced refrigerant materials with multiple magnetic phase transitions.