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<p>Magnetic refrigeration is an environmentally friendly, energy-efficient technology that exploits the temperature change of a magnetic material under a changing magnetic field. Herein, we characterize the phase purity and structure of polycrystalline EuB<sub>2</sub>O<sub>4</sub> synthesized via solid-state sintering, as well as analyze the magnetic properties and magnetocaloric effect. The studied sample exhibits a highly pure orthorhombic phase structure. The sample undergoes a transition from antiferromagnetism to paramagnetism. The relative concentrations of Eu<sup>2+</sup> and Eu<sup>3+</sup> ions are calculated to be 20.49% and 79.51%, respectively. The magnetic Eu<sup>2+</sup> ions mainly determine the magnetic properties. Under magnetic fields of 2 and 5 T, the maximum values of magnetic entropy change reach 21.0 and 41.8 J&#xa0;kg<sup>−1</sup>&#xa0;K<sup>−1</sup>, respectively. The corresponding maximum values of adiabatic temperature change are 7.1 and 22.7 K. The Arrott plot reveals a second-order phase transition in EuB<sub>2</sub>O<sub>4</sub>. The large magnetic entropy change highlights EuB<sub>2</sub>O<sub>4</sub> as a competitive and excellent ultra-low-temperature magnetic cooling material.</p>

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EuB2O4: Potential magnetic refrigeration material

  • 期刊论文

  • 发表日期：

    2026年5月6日

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  • Changming Liu,
  • Fangyuan Zhang,
  • Hang Shentu,
  • Xiukun Hu,
  • Qiong Wu,
  • Minxiang Pan,
  • Jieyang Fang,
  • Hangfu Yang,
  • Hongliang Ge

摘要

Magnetic refrigeration is an environmentally friendly, energy-efficient technology that exploits the temperature change of a magnetic material under a changing magnetic field. Herein, we characterize the phase purity and structure of polycrystalline EuB2O4 synthesized via solid-state sintering, as well as analyze the magnetic properties and magnetocaloric effect. The studied sample exhibits a highly pure orthorhombic phase structure. The sample undergoes a transition from antiferromagnetism to paramagnetism. The relative concentrations of Eu2+ and Eu3+ ions are calculated to be 20.49% and 79.51%, respectively. The magnetic Eu2+ ions mainly determine the magnetic properties. Under magnetic fields of 2 and 5 T, the maximum values of magnetic entropy change reach 21.0 and 41.8 J kg−1 K−1, respectively. The corresponding maximum values of adiabatic temperature change are 7.1 and 22.7 K. The Arrott plot reveals a second-order phase transition in EuB2O4. The large magnetic entropy change highlights EuB2O4 as a competitive and excellent ultra-low-temperature magnetic cooling material.