High-Performance Thermomagnetic Gd-Si-Ge Alloys

Saurabh Singh, Na Liu, Yu Zhang, Amin Nozariasbmarz, Sumanta Kumar Karan, Lavanya Raman, Gagan K. Goyal, Shweta Sharma, Wenjie Li, Shashank Priya, Bed Poudel

Research output: Contribution to journalArticlepeer-review

Abstract

Exploring low-grade waste heat energy harvesting is crucial to address increasing environmental concerns. Thermomagnetic materials are magnetic phase change materials that enable energy harvesting from low-temperature gradients. To achieve a high thermomagnetic conversion efficiency, there are three main material requirements: (i) magnetic phase transition near room temperature, (ii) substantial change in magnetization with temperature, and (iii) high thermal conductivity. Here, we demonstrate a high-performance Gd5Si2.4Ge1.6 thermomagnetic alloy that meets these three requirements. The magnetic phase transition temperature was successfully shifted to 306 K by introducing Ge doping in Gd5Si4, and a sharper and more symmetric magnetization behavior with saturation magnetization of Mmax = 70 emu/g at a 2 T magnetic field was achieved in the ferromagnetic state. The addition of SeS2, as a low-temperature sintering aid, to the Gd-Si-Ge alloy improved the material’s density and thermal conductivity by ∼45 and ∼275%, respectively. Our results confirm that the (Gd5Si2.4Ge1.6)0.9(SeS2)0.1 alloy is a suitable composite material for low-grade waste heat recovery in thermomagnetic applications.

Original languageEnglish (US)
Pages (from-to)35140-35148
Number of pages9
JournalACS Applied Materials and Interfaces
Volume15
Issue number29
DOIs
StatePublished - Jul 26 2023

All Science Journal Classification (ASJC) codes

  • General Materials Science

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