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<p>This study computationally investigates Gd<sub>x</sub><i>R</i><sub>(1-x)</sub> binary alloys (<i>R</i> = Tb, Dy, Ho, Er, Tm) to develop magnetocaloric materials that outperform pure Gadolinium (Gd) for room-temperature magnetic refrigeration. Using the Weiss-Debye-Sommerfeld model, performance was assessed via energetic metrics (<i>ΔT</i><sub>ad</sub>, <i>ΔS</i><sub>T</sub>, RCP) and practical engineering indicators based on mass, volume, cost, and abundance. Among the pure elements, Ho was the top performer. Critically, the alloys Gd₀.₆Ho₀.₄ and Gd₀.₆Dy₀.₄ were identified as the most effective compositions at 2 <i>T</i>, with Gd₀.₆Ho₀.₄ enhancing the mass- and volume-based Relative Cooling Power by 12.5% and 18%, respectively, over pure Gd. These findings identify specific, high-performance candidates for next-generation magnetic cooling technologies.</p>

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Magnetocaloric effect and engineering trade-offs in Gd-based rare earth binary alloys: a comparative analysis

  • 期刊论文

  • 发表日期：

    2026年4月16日

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  • Zoubir Guaddouche,
  • Ali Boumedien,
  • Ammar Zeghloul,
  • Abdelsalam Al-Sarkhi,
  • Ali Cherif

摘要

This study computationally investigates GdxR(1-x) binary alloys (R = Tb, Dy, Ho, Er, Tm) to develop magnetocaloric materials that outperform pure Gadolinium (Gd) for room-temperature magnetic refrigeration. Using the Weiss-Debye-Sommerfeld model, performance was assessed via energetic metrics (ΔTad, ΔST, RCP) and practical engineering indicators based on mass, volume, cost, and abundance. Among the pure elements, Ho was the top performer. Critically, the alloys Gd₀.₆Ho₀.₄ and Gd₀.₆Dy₀.₄ were identified as the most effective compositions at 2 T, with Gd₀.₆Ho₀.₄ enhancing the mass- and volume-based Relative Cooling Power by 12.5% and 18%, respectively, over pure Gd. These findings identify specific, high-performance candidates for next-generation magnetic cooling technologies.