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<p>The structure, magnetic behavior and magnetocaloric performance in heavy rare–earth based compounds Tb<sub>2</sub><i>M</i>TiO<sub>6</sub> (<i>M</i> = Co, Ni, Cu) have been experimentally investigated in this work. The structural analysis indicates that Tb<sub>2</sub>CoTiO<sub>6</sub> and Tb<sub>2</sub>NiTiO<sub>6</sub> crystallize in a monoclinic double perovskite structure, while Tb<sub>2</sub>CuTiO<sub>6</sub> forms a hexagonal layered structure. The magnetic measurements reveal that the samples show high magnetic reversibility within a wide temperature range. The high-temperature Curie–Weiss fitting suggests that the antiferromagnetic coupling between RE<sup>3+</sup>  and RE<sup>3+</sup> is dominant at low temperatures. The Arrott-plots imply that the magnetic transition in Tb<sub>2</sub><i>M</i>TiO<sub>6</sub> is of second–order nature according to the Banerjee’s criteria. The magnetic entropy change − Δ<i>S</i><sub>M</sub> is evaluated to be 10.7, 16.2 and 13.2 J&#xa0;kg<sup>−1</sup>&#xa0;K<sup>−1</sup> for Tb<sub>2</sub>CoTiO<sub>6</sub>, Tb<sub>2</sub>NiTiO<sub>6</sub> and Tb<sub>2</sub>CuTiO<sub>6</sub> at 4 K and magnetic field change Δ<i>H</i> = 6&#xa0;T, respectively. The work suggests that the lack of 3<i>d</i>–3<i>d</i> coupling in the design of double perovskites is one of the potential approaches for developing low-temperature magnetic refrigeration materials.</p>

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A comparative investigation on structural, magnetic and magnetocaloric properties of Tb2MTiO6 (M = Co, Ni, Cu) compounds

  • 期刊论文

  • 发表日期：

    2025年7月3日

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  • Canglong Li,
  • Kexin Wen,
  • Bing Zhang,
  • Jie Chen,
  • Xinshuai Niu,
  • Boyuan Zou,
  • Xuechi Lu,
  • Wenqian Yang

摘要

The structure, magnetic behavior and magnetocaloric performance in heavy rare–earth based compounds Tb2MTiO6 (M = Co, Ni, Cu) have been experimentally investigated in this work. The structural analysis indicates that Tb2CoTiO6 and Tb2NiTiO6 crystallize in a monoclinic double perovskite structure, while Tb2CuTiO6 forms a hexagonal layered structure. The magnetic measurements reveal that the samples show high magnetic reversibility within a wide temperature range. The high-temperature Curie–Weiss fitting suggests that the antiferromagnetic coupling between RE3+  and RE3+ is dominant at low temperatures. The Arrott-plots imply that the magnetic transition in Tb2MTiO6 is of second–order nature according to the Banerjee’s criteria. The magnetic entropy change − ΔSM is evaluated to be 10.7, 16.2 and 13.2 J kg−1 K−1 for Tb2CoTiO6, Tb2NiTiO6 and Tb2CuTiO6 at 4 K and magnetic field change ΔH = 6 T, respectively. The work suggests that the lack of 3d–3d coupling in the design of double perovskites is one of the potential approaches for developing low-temperature magnetic refrigeration materials.