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High-Performance Thermomagnetic Gd-Si-Ge Alloys.

Saurabh Singh1, Na Liu1, Yu Zhang1

  • 1Department of Materials Science and Engineering, Pennsylvania State University, University Park, Pennsylvania 16802, United States.

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|July 17, 2023
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Summary
This summary is machine-generated.

This study presents a novel Gd-Si-Ge alloy for efficient low-grade waste heat energy harvesting. The developed thermomagnetic material exhibits enhanced properties for practical applications in converting thermal gradients into usable energy.

Keywords:
gadoliniumlow-grade thermal energy harvestingmagnetic alloysphase transitionthermomagnetic

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Area of Science:

  • Materials Science
  • Energy Harvesting
  • Thermodynamics

Background:

  • Increasing environmental concerns necessitate efficient low-grade waste heat energy harvesting.
  • Thermomagnetic materials offer a promising route for energy conversion from low-temperature gradients.
  • Key material requirements include near-room-temperature magnetic phase transitions, significant magnetization changes, and high thermal conductivity.

Purpose of the Study:

  • To develop a high-performance thermomagnetic alloy for efficient low-grade waste heat recovery.
  • To optimize the material composition and processing for enhanced thermomagnetic properties.

Main Methods:

  • Synthesis of a Gadolinium-based alloy (Gd5Si2.4Ge1.6) with germanium doping.
  • Incorporation of Selenium Disulfide (SeS2) as a sintering aid to improve material characteristics.
  • Characterization of magnetic phase transition temperature, magnetization behavior, density, and thermal conductivity.

Main Results:

  • The Gd5Si2.4Ge1.6 alloy exhibited a magnetic phase transition at 306 K.
  • Ge doping resulted in sharper magnetization behavior and a saturation magnetization of 70 emu/g at 2 T.
  • The addition of SeS2 significantly improved density (~45%) and thermal conductivity (~275%) of the alloy.

Conclusions:

  • The (Gd5Si2.4Ge1.6)0.9(SeS2)0.1 composite material demonstrates suitability for low-grade waste heat recovery.
  • Optimized thermomagnetic properties make this alloy a strong candidate for practical thermomagnetic energy harvesting applications.