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<p>The Gd<sup>3+</sup>/Dy<sup>3+</sup> co-doping compounds of Gd<sub>(1 – x)</sub>Dy<sub>x</sub>PO<sub>4</sub> (x = 0, 0.1, and 0.2) were synthesized via chemical precipitation and solid-state reaction. The crystal structures, phase transition temperatures, maximum value of the magnetic entropy changes (−Δ<i>S</i><sup>Max</sup> <sub>M</sub>), and relative cooling powers have been investigated. X-ray diffraction revealed that the samples exhibited monoclinic crystal structures with the <i>P</i>2<sub>1</sub>/<i>n</i> space group. The magnetization measurements revealed that the samples underwent second-order ferromagnetic-paramagnetic transitions, and the transition temperature decreased with increasing Dy content. Under the magnetic field of 50 kOe, large −ΔS<sup>Max</sup> <sub>M</sub> values of 50.1, 43.7, and 41 J/kg K were obtained at a temperature close to the liquid helium temperature. As the Dy content increased, the  <i>RCP</i> and <i>TEC</i>(2) were significantly improved. The considerable MCEs suggest that these compounds can be used in the development of low-temperature magnetic refrigeration materials.</p>

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Considerable Magnetocaloric Effects of Dysprosium-Doped Gadolinium Phosphate Compounds

  • 期刊论文

  • 发表日期：

    2026年7月22日

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  • Jieyang Fang,
  • Yiwen Ding,
  • Lei Zhou,
  • Xiukun Hu,
  • Qiong Wu,
  • Hangfu Yang,
  • Hongliang Ge

摘要

The Gd3+/Dy3+ co-doping compounds of Gd(1 – x)DyxPO4 (x = 0, 0.1, and 0.2) were synthesized via chemical precipitation and solid-state reaction. The crystal structures, phase transition temperatures, maximum value of the magnetic entropy changes (−ΔSMax M), and relative cooling powers have been investigated. X-ray diffraction revealed that the samples exhibited monoclinic crystal structures with the P21/n space group. The magnetization measurements revealed that the samples underwent second-order ferromagnetic-paramagnetic transitions, and the transition temperature decreased with increasing Dy content. Under the magnetic field of 50 kOe, large −ΔSMax M values of 50.1, 43.7, and 41 J/kg K were obtained at a temperature close to the liquid helium temperature. As the Dy content increased, the  RCP and TEC(2) were significantly improved. The considerable MCEs suggest that these compounds can be used in the development of low-temperature magnetic refrigeration materials.